IIO: 2nd set of new device support, features and cleanup for 6.10

The usual mixed bag from towards the end of the cycle.

New devices support
===================

invensense,icm42600
- Support the ICM-42686-P a high range device going up to 32g and 4000 dps

New features
============

adi,ad7944
- Add support for chain mode in which many ADCs may be daisy chained and
  read out via a single long read.
adi,ad9467/backend library
- Add bus tuning related interfaces.
adi,axi-adc
- Add control for the AXI clock - seems always enabled early in boot for other
  reasons, but the driver should not rely on that..

Cleanups and minor or late breaking fixes
=========================================

Micrsoft/ACPI mount matrix handling.
- Replace several implementations of the Microsoft defined ROTM ACPI
  method with a single one.
multiple drivers
- Don't call the result of wait_for_completion() timeout as it's
  more accurate as time_left.
adi,ad7266
- Stop setting the iio_dev->masklength as it's done by the IIO core and
  should not be set from drivers.
adi,ad799x
- Some checkpatch type fixes.
adi,ad9839
- Ensure compelte MU_CNT1 is written during lock phase.
adi,axi-dac
- Fix inverted parameter.
adi,adis16475
- Drop documentation of non existent sysfs files.
avago,apds9306
- Fix an off by one error that overly restricts the range of persistence
  and adaptive thresholds that the driver accepts.
freescale,mxs-lradc
- Stop setting the iio_dev->masklength as it's done by the IIO core and
  should not be set from drivers.
invensense,timestamp library
- Fix timestamp vs interupt alignment and aovid soms glitches that
  occured when switching sampling frequency.
microchip,mcp3564
- Make use of device_for_each_child_node_scoped() to allow early release
  without manual fwnode_handle_put().
microchip,mcp9600
- Allow for negative temperatures.
microchip,pac1934
- Avoid an out of bounds array index.
richtek,rtq6056
- Use iio_device_claim_direct_scoped() to automate lock release and simplify
  the code.
sensortek,stk3110
- Drop a likely incorrect ACPI ID. No known users of this ID and it's
  not a valid ACPI ID.
ti,ads1015
- Make use of device_for_each_child_node_scoped() to allow early release
  without manual fwnode_handle_put().
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