staging: iio: accel: adis16203: Fix 'line over 80 characters' warning

Many of the comments in the same lines with #define
caused checkpatch warning 'line over 80 characters'.

Move all such comments to line before #define.
This style is already used in some other .h files in accel:

Add blank lines after #define to improve readability.

Signed-off-by: Svetlana Orlik <sveta.orlik.code@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>