Add support for the following inputs:
 - radio tuner
 - composite 1 & 2 (only 1 is physically available, but composite 2 is also
   advertised by windows driver)
 - svideo
Signed-off-by: Vincent Pelletier <plr.vincent@gmail.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>