media: ov8856: Implement sensor module revision identification

Query the sensor for its module revision, and compare it
to known revisions.

Currently 2A and 1B revision indentification is supported.

[Sakari Ailus: Wrap a line over 80, alignment, use %u for printing u32]

Signed-off-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>