This is a follow-up to commits e15bdaa1
and 07bf22cc.

The above two commits added some enumerated gain values and those
are not currently handled by the inverting function. Add the missing
entries to the conversion array in the function.

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>

In order to bring consistency in-tree, migrate all drivers to the new
prefix <zephyr/...>. Note that the conversion has been scripted, refer
to #45388 for more details.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>

	git grep -l 'u\(8\|16\|32\|64\)_t' | \
		xargs sed -i "s/u\(8\|16\|32\|64\)_t/uint\1_t/g"
	git grep -l 's\(8\|16\|32\|64\)_t' | \
		xargs sed -i "s/s\(8\|16\|32\|64\)_t/int\1_t/g"

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>

Add missing entry for ADC_GAIN_128 in the adc_gain_invert() function.

This fixes 4420c5ed.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>

Gain values are specified with enumeration values that can't be used
to reverse the effects of scaling the input signal.  Provide a
function that reverses the effect of the gain by scaling a measured
value.

Also provide a function that converts a raw measurement captured with
a reference voltage and specific gain and resolution to the
corresponding voltage in millivolts.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>