media: i2c: ds90ub960: Move UB9702 registers to a separate section

media: i2c: ds90ub960: Move UB9702 registers to a separate section

The driver supports both UB960 and UB9702. While devices work in similar
ways and have a lot of identical registers, there are also plenty of
differences.

To clarify the situation a bit, move the UB9702 registers to a separate
section and prefix them with UB9702.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Jai Luthra <jai.luthra@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>