staging: iio: cdc: ad7746: Break up use of chan->address and use FIELD_PREP etc

Instead of encoding several different fields into chan->address use
an indirection to a separate per channel structure where the various
fields can be expressed in a more readable form.  This also allows
the register values to be constructed at runtime using FIELD_PREP().

Drop the now redundant _SHIFT macros.

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

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