[media] saa7134: Add AverMedia A706 AverTV Satellite Hybrid+FM

Add AverMedia AverTV Satellite Hybrid+FM (A706) card to saa7134 driver.
Working: analog inputs, TV, FM radio and IR remote control.
Untested: DVB-S.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>