[media] v4l: Add subdev selections documentation
Add documentation for V4L2 subdev selection API. This changes also experimental V4L2 subdev API so that scaling now works through selection API only. Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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