[media] v4l: v4l2_subdev userspace format API - documentation binary files

Add images used by the V4L2 subdev userspace format API documentation.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>