[media] saa7134: support MagicPro ProHDTV Pro2 Hybrid DMB-TH PCI card

This card has a TD18271 silicon tuner, and uses TDA8290 and LGS8G75 to
demodulate analog and digital broadcast respectively.  GPIO configurations
were derived using DScaler regspy.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>