2nd set of IIO fixes for the 6.4 cycle.

Given how late this pull request is, I'm expecting these to get queued
up for the 6.5 merge window.

- adi,ad7192
  * Fix a null pointer as spi_set_drvdata() is no longer called.
  * Fix wrong check prior to using internal clock.
  * Fix dt-binding to make it clear the voltage reference is required.
- adi,ad74413
  * DIN_SINK should not be set for functions other than digital inputs.
    Enforce that in the driver.
- amlogic,meson-saradc
  * Fix clock divider mask length - affects only meson 8 family.
- freescale,fxls8962af
  * Fix endian type and shift of channels to match with default device setup.
  * Narrow errata handling to FXLS8962AF only as doesn't affect other devices
    supported by this driver.
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