staging:iio:ad7793: Move register definitions from header to source

The only user of the register definitions is the driver itself, so move them
from the header file to the driver source file. The header file now only
contains the platform data struct.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2 files changed