3rd set of new device support features and cleanup for IIO in the 5.10 cycle.

A late set given it seems the 5.10 cycle is going to start a bit later
than expected and quite a bit came in.  Includes some late breaking
fixes that can wait for the merge window.

New device support
* ad9467
  - ad9434 support including dt bindings update
  - ad9265 support including dt bindings update

Yaml conversion
* amlogic,meson-saradc

Core rework (heading towards multiple buffer support)
* refactor iio_device_register_eventset
* Null-ify IIO device's event_interface during unregister.

Features
* ad7291
  - convert from platform_data to devicetree including bindings doc.
* core
  - Add titles to a few IIO config symbols to allow simpler out of tree
    building.  It does little harm so why not enable it.

Fixes
* ad7292
  - Fix missing of_node_put()
* at91-sama5d2
  - Fix a crash due to missordering of dma enabling as a result of recent
    IIO wide rework.
* gyro-adc
  - Fix missing of_node_put()
* ltc2983
  - Fix missing of_node_put()
* stm32-adc
  - Fix an issue with runtime autosuspend related to parent autosuspending.

Cleanups
* counter/ti-eqep
  - Tidy up a , instead of ;
* buffer-dmaengine
  - Drop the unmanaged allocator functions as no one is using them.
* at91-sama5d2
  - devm_platform_get_and_ioremap_resouce() replacing boilerplate.
* cros_ec
  - move the hw fifo attributes setup into the cros_ec core.
* gp2ap002
  - comment typo
* microchip-tcb-capture:
  - consitifcation
* ssp
  - Use PLATFORM_DEVID_NONE instead of -1 to convey true meaning.
* stm32-dfsdm
  - devm_platform_get_and_ioremap_resouce() replacing boilerplate.
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