media: v4l2-ctrls: Document V4L2_CID_NOTIFY_GAINS control

media: v4l2-ctrls: Document V4L2_CID_NOTIFY_GAINS control

commit 311a839a1ad255ebcb7291fb4e0d2ec2f32312a7 upstream.

Add documentation for the V4L2_CID_NOTIFY_GAINS control.

This control is required by sensors that need to know what colour
gains will be applied to pixels by downstream processing (such as by
an ISP), though the sensor does not apply these gains itself.

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>