media: ov08x40: Add shared global register list

This follows the previous cleanup commit where duplicate entries were
removed from each mode's register list.

Signed-off-by: Jason Chen <jason.z.chen@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>