[media] mn88473: fix chip id check on probe

[media] mn88473: fix chip id check on probe

A register used to identify chip during probe was overwritten during
firmware download and due to that later probe's for warm chip were
failing. Detect chip from the another register, which is located on
different register bank 2.

Fixes: 7908fad99a6c ("[media] mn88473: finalize driver")
Cc: <stable@vger.kernel.org> # v4.8+
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>