V4L/DVB (9798): saa7134: add analog and DVB-T support for Medion/Creatix CTX946

How to enable the mpeg encoder is not found yet.
The card comes up with gpio 0x0820000 for DVB-T.

Signed-off-by: Hermann Pitton <hermann-pitton@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>