[media] go7007: convert to the control framework and remove obsolete JPEGCOMP support

Just add a read-only V4L2_CID_JPEG_ACTIVE_MARKER control to replace
the JPEGCOMP support.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>