[media] bt8xx: add support for PCI device ID 0x36c

add support for conexant PCI device 0x36c. Seems to be fully compatible with
the currently supported chips, yet the chip has different PCI ID.

Signed-off-by: Peter De Schrijver <p2@psychaos.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>