[media] Add AC97 8384:7650 for some versions of EMP202

Fix detection of EMP202 audio chip. Some versions have an id of
0x83847650 instead of 0xffffffff

Honestech Vidbox NW03 has a EMP202 audio chip with a different Vendor ID.

Apparently, it is the same with the Gadmei ITV380:
http://linuxtv.org/wiki/index.php/Gadmei_USB_TVBox_UTV380



Signed-off-by: Gareth Williams <gareth@garethwilliams.me.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>