media: ov2680: Add bus-cfg / endpoint property verification

Verify that the number of CSI lanes and link-frequency specified
in the endpoint fwnode are correct.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>