staging:iio:adc:ad7280a: Use bitfield ops to managed fields in transfers.

The write and two types of read transfer are sufficiently complex that
they benefit from the clarity of using FIELD_PREP() and FIELD_GET().
This also applies to the handling in ad7280_event_handler() so
use a similar approach there as well.

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

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