First set of new device support, features and fixes for IIO in the 5.2 cycle.

Note includes, an immutable branch from MFD to bring in the stmpe code
to which some fixes were later made.

Staging graduations
* ad7780
  - Move this ADC driver out of staging.  Included adding some new features
    along the way (see below). Also added DT bindings.

New device support
* adis16480
  - Support the ADIS16495 and ADIS16497 IMU devices making
    heavy use of refactoring of various aspects of the driver in precursor
    patches.
* lsm6dsx
  - Support for the ASM330LHH 6-axis (accelerometer + gyro) sensor.
  - Support for the LSM6DS0X
* matbotix mb1232
  - New driver for this ultrasound ranging device family. Including bindings.
  - Supports mb1202, mb1212, mb1222, mb1232, mb1242, mb7040 and mb7137.
* max31856
  - New driver for this thermocouple temperature sensor.
* meson saradc
  - Support the Meson-G12A (ID addition only).
* stmpe-adc
  - New driver supporting generic ADC alongside touchscreen support which
    previously existed. Includes DT bindings.
* vcnl4000
  - Support for the vcln4040 proximity and light sensor, including adding
    DT bindings for this and parts previously supported.

Features
* core
  - Allow reading of mount matrices from ACPI in addition to DT.
  - Common binding for theromcouple types.
* ad5933
  - Add ABI docs as there are a few 'unsual' elements about this
    device - perhaps because it's our only impedance analyser.
* ad7780
  - Add gain and filter gpio support + readback of current gain and filter.
* adis16480
  - Allow selection fo the dataready pin to be used.
  - Device tree ID table and binding documentation.
  - Support external clock modes, including new bindings.
* bma180
  - Mount matrix support.
* bmc150
  - Mount matrix support.
* bmg160
  - Mount matrix support.
  - DT id table and bindings doc.
* bmp280
  - Put calibration data into the entropy pool.
* hmc5843
  - Mount matrix support.
* itg3200
  - Mount matrix support.
* kxcjk1013
  - Device tree id table, and binding docs.
* lpc32xx
  - Add scale when regulator specified including DT docs for regulator.
* pms7003
  - Add device IDs for all supported parts to driver and binding.
* stm32-dfsdm
  - Enable hw consumer support, scan mode control and a complex set of
    triggered buffer modes.
  - Power management.
* stm32-lptimer-counter
  - power management.
  - Document the pinctrl sleep state binding.
* ti-ads7950
  - GPIO pin support.

Cleanups, minor fixes
* core
  - Use bitmap_zalloc to make it explicit that is what we are doing.
  - Tidy up all the Kconfig files (which had slowly gotten messy)
  - Fix a forwards definition missing issue in iio/driver.h
* ad sigma delta core
  - Improve handling of SPI bus locking vs CS assertion.  This has been
    wrong a long time so not rushing this in.
* ad5064
  - Mlock to local lock.
* ad5933 (staging cleanup)
  - Multiline comment fixes.
  - Include ordering.
  - SPDX.
  - Tidy up Kconfig help which was a bit missleading.
  - Change some non standard attributes to ABI defined ones.
* ad7124
  - White space fix.
* ad7192
  - White space.
  - Use DT clock binding.
  - Improve error reporting.
  - Platform data to DT conversion.
  - Use read_avail callback, mostly to avoid the endless series of
    patches from new contributors trying to falsely put spaces around
    the negative sign.
* ad7280a
  - Add brackets to macros to avoid potential precedence isseus.
  - Add temp vars for event codes to reduce indent and improved readability.
  - Clean out som CamelCase notation.
  - White space.
* ad7606
  - Fix broken file naming in MAINTAINERS.
* ad7766
  - White space fixes.
* ad7780
  - Missing switch defaults to supress warnings and harden the code slightly.
  - Set pattern masks more directly.
  - Add ID values and masks for all supported chips.
  - SPDX + add Renato as a copyright holder as he has done a lot of work on
    this driver.
  - Add brackets to macros to avoid potential precedence issues.
* ad7923
  - White space fixes.
  - Use BIT macro to improve readability.
  - Add brackets to macros to avoid potential precedence issues.
  - Tidy up a null comparisom.
* ad9523
  - Fix a typo in naming of variables.
* adis16400
  - Combine trigger file into main code as no advantage in separate files.
    Rename core file to just adis16400.
  - Squash the header into the c file now there is only one file.
  - Generalize burst mode to support new variants.
* ak8975
  - Local variable to improve readability around mount matrix support.
* as3935
  - Avoid potential race by ensuring remove does exact opposite of
    probe rather than a slightly different order.
* cross_ec
  - Drop some unnecessary includes.
  - Fix some warning and the slightly 'unusual' code.
  - Add some docs for non obvious function.
  - SPDX
* hmc5843
  - Potential unhandled error case.
* iio trigger core
  - Print an error if there is no available irq due to max consumers per
    trigger being set to low.
* iio loop trigger
  - Drop an unlikely on IS_ERR as IS_ERR already has the annotation.
* ingenic-adc
  - Drop a redundant dev_err call as devm_ioremap_resource reports the same
    internally.
* lmp91000
  - Drop some unncessary parentheses and white space tidy up.
  - Invert and if statement to improve readability.
  - Fix a wrong error message.
* lpc32xx
  - Header sorting + drop some unused ones.
* mma8542
  - Mark a switch fallthrough.
* mpu6050
  - Add a local variable to improve code readability around mount matrix
    support.
* mxs-lradc-adc
  - Handle devm_iio_trigger_alloc failure.
* sps30
  - Fix up a kernel version in the ABI docs.
* srf04
  - DT binding doc converted to yaml.
* ssp_sensors
  - Supress a clang build warning due to lack of visibility of conditional
    within a iio_push_to_buffers_with_timestamp.  (reasonable false warning!)
* st_accel
  - Drop pointless less than 0 comparisom of unsigned int.
* stm32-dfsdm
  - Improve accuracy of spi_master_frequency calculation.
  - Improve calculation fo sampling frequency.
  - Rework various internals to simplify adding triggered buffer support.
  - Claim direct mode to avoid racing around read_raw and being in buffered
    mode.
* stmpe
  - Some tidy ups from the mfd tree (immutable branch)
  - Fix a clang false positive warning.
* ti-ads7950
  - Use local lock rather than using the core mlock when not locking around
    the device mode.
* vcnl4000
  - Use word writes instead of byte writes.  It seems byte writes are fine
    for some parts (undocument) but not others that the driver will shortly
    support.

Other
* mailmap
  - Add email address change for Sean Nyekjaer.  Update in relevant drivers
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