IIO: 2nd set of new device support, features and cleanup for 6.7

A few things that weren't quite ready for the previous pull but would
be nice to sneak into the 6.7 merge window if possible.

Includes a few generic firmware property helpers.

New device support
------------------
* bosch,bmi323
  - New driver supporting this 6 axis IMU
* maxim, max34408
  - New driver supporting the MAX34408 and MAX34409 current monitors.

Features
--------
* adi,ad2s1210 (additional stuff post move out of staging)
  - Add support for configurations where the mode pins on the chip are
    hardwired.
  - Add support for reset gpio usage at probe if the pin is wired.

Cleanup
-------
Firmware property related.
- Add fwnode_property_match_property_string() helper for when we
  a match against an element in an array of predefined strings is
  wanted.  Use this in adf4377, admv1014, tmag5273 and sx9324 IIO drivers.
- Use fwnode_property_string_array_count() within property.c instead
  of open coded variant.
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