First set of new device support, cleanups and features for IIO in the 4.16 cycle

New device support
* IDT Z0PT2201 ambient light and UVB sensor
  - new driver and DT bindings.
* MAX30102 (pulse oximetery sensor)
  - support for MAX30105 sensor (smoke detector)  Just goes to show
    how two supposedly totally different applications can use very similar
    devices.
* UVIS25 UV sensor
  - new driver and DT bindings.

Major new features
* at91-sama5d2-adc
  - DMA support including bindings + a fix for an issue with acking the
    interrupt to prevent false overrun reports.
* ina2xx
  - allow control of shunt voltage PGA and bus voltage range to give better
    accuracy in some cases.
* stm32-adc
  - support differential channels (precursor patch reworked how channel names
    were created to enable this).

Cleanups / minor fixes / features
* core
  - mark a deliberate switch fallthrough.
  - macro to populate struct iio_map array elements.
* docs
  - typo fix.
* MAINTAINERS
  - add some missing entries for IIO ABI files.

* ad7152
  - tidy up unlocking paths.
* ad7746
  - tidy up unlocking paths.
* ak8975
  - add an ACPI id found on a prototype board.
* aspeed-adc
  - deassert reset in probe to ensure device is usable.
* bfin-trigger
  - platform_get_irq return value fixing.
* bmc150
  - OF device ID table for i2c (spi to be done).
* cros_ec
  - unused variable cleanup.
* da208
  - ACPI binding seen on Linx 820 tablet.
* ina2xx
  - shift down raw value to drop status flags from value (likely to have
    been hidden in the noise).
  - tidy up a special case that wasn't needed.
* inv_mpu6050
  - i2c_unregister_device knows about null values so don't check it twice.
* kxsd9
  - fix missing MODULE_LICENSE and MODULE_DESCRIPTION.
* max30102
  - missing new lines in dev_err.
  - inconsistent punctuation in error messages.
  - fix LED mode mask number of bits.
  - check return value of power mode functions to handle errors.
  - introduce an intensity channel macro to reduce duplication.
  - fix minor issue where device wasn't necessarily enabled during
    a get temperature.
  - use indicies for LED channels.
  - move the mode seetting to buffer_postenable - precursor to new device
    support.
  - prepare to allow copying of varying numbers of measurement.
* meson-saradc
  - drop irrelevant clock and update bindings.
* mma8452
  - a couple of renames for readability reasons.
* qcom_vadc
  - fix missing MODULE_LICENSE and MODULE_DESCRIPTION.
* st_accel
  - drop an unused variable.
* sx9500
  - add an ACPI id found on a prototype board.
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