1st set of IIO fixes for 6.5

Usual mixed bag of fixes for recently introduced issues and ones from way
back that have recently been noticed.

* core
  - Avoid a device with no parent issues seen on the dummy example device.
* adi,ad71145
  - Drop ref now that dt-schema supports -nanoamp.
* adi,ad7192
  - Fix wrong bit set for enabling AC excitation and exposure of control
    on devices without the feature.
* adi,admv1013
  - Don't ignore errors from regulator_get_voltage().
* amlogic,meson-adc
  - Make sure clocks enabled early enough.
* google,cros_ec
  - Fix undersized cros_ec_command allocation that resulted in a buffer
    overrun.
* rohm,bu27008
  - Fix truncation issue with scale format that prevents smallest value
    being set
  - Report intensity as unsigned. Previously large values would be
    interpretted as negative intensities (and odd concept).
* rohm,bu27034
  - Fix truncation issue with scale format that prevents smallest value
    being set.
* st,lsm6dsx
  - Return an error code, not false (which is 0 and hence success)
    to indicate ACPI mount matrix retrieval failed due to no ACPI
    support.
* ti,ina2xx
  - Avoid a NULL pointer dereference if fall back compatible is used.
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