V4L/DVB (3446): Saa7134: add support for AVerMedia A169 Dual Analog tuner card

- Added support for AVerMedia A169 Dual Analog tuner card
  (dual saa7134 decoders - only 1 working right now)
- Added autodetection for both parts of the card.
  It shows up like 2 cards, B1 and B
- Enabled tuner B1, SVIDEO on B1 and composite1 through SVIDEO,
  FIXME: B is more or less dead at this point and I suspect the
  FM-radio is on the B part of the board

Signed-off-by: Rickard Osser <ricky@osser.se>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>