media: Add ADV7610 support for adv7604 driver - DT docs.

ADV7610 is another HDMI receiver chip, very similar to
the ADV7611. Tested on TinyRex BaseBoard Lite.

Signed-off-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>