2nd set of IIO fixes for the 6.6 cycle.

Note, given timing my expectation is these will be queued for the
6.7 merge window but they could go quicker if the 6.6 cycle ends up
being extended.

afe:
  * Allow for channels with offset but no scale.  In this case the scale
    can be assumed to be 1.
adi,ad74115:
  * Add missing dt-binding constraint on number of reset-gpios.
samsung,exynos:
  * Don't request touchscreen interrupt if it is not going to be used,
    getting rid of an incorrect resulting warning message.
xilinx,xadc:
  * Avoid changing preset voltage and themperature thresholds as they
    are typicaly set as part of FPGA image building so should be left
    alone.
  * Fix wrong temperature offset and scale for some devices.
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