[media] af9035: initial support for IT9135 chip

AF9035 code needed for IT9135 chip support. Needs still small
changes for AF9033 and totally new tuner driver in order to
get that chip version working.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>