[media] cx23885: convert to the control framework

This is part 1, converting the uncompressed video/vbi nodes to use
the control framework.

The next patch converts the compressed video node as well.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>