iio: adc: axp20x_adc: Minor code cleanups

The code may be clearer if parameters are not re-purposed to hold
temporary results like register values, so introduce local variables
as necessary to avoid that. Regroup macros based on chip type, and
use the FIELD_PREP() macro instead of a hand-rolled version.

Suggested-by: Jonathan Cameron <[email protected]>
Reviewed-by: Chen-Yu Tsai <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Aidan MacDonald <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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