V4L/DVB: Read MAC for TeVii S470 PCI-e DVB-S2 card

This patch retrieve the correct mac address from the eeprom for TeVii
S470 card.

Signed-off-by: Pierre Gronlier <pierre.gronlier@gmail.com>
Cc: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>