V4L/DVB (9057): saa7134: Hauppauge HVR-1110, support for radio and analog audio in

The audio switch is at 0x100 and radio on gpio 21.

Tested-by: Thomas Genty <tomlohave@gmail.com>
Signed-off-by: David Bentham <db260179@hotmail.com>
Reviewed-by: Hermann Pitton <hermann-pitton@arcor.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>