2nd set of IIO features and cleanups for the 6.4 cycle.

A few more changes. Some were dependent on fixes that are now upstream
and in char-misc-next.

st,lsm6dsx:
 - Add an ACPI ID (SMO8B30) and mount matrix (ROTM) seen in the wild.
ti,palmas
 - Take probe fully devm managed.
 - Add threshold event support (after some rework)
 - Stop changing the event config on suspend and resume.
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