[media] cx23885: add support for Mygica X8507

This patch supports card Mygica X8507 (analog part)

This controller is a copy of driver card Mygica X8506

This patch depends on patch cx23885-alsa

To do: FM, ISDB-t, remote control, audio for composite1, S-Video and
video component.

Signed-off-by: Alfredo J. Delaiti <alfredodelaiti@netscape.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>