media: i2c: max9286: Support 12-bit raw bayer formats

Add support for 12-bit raw bayer formats to the driver, configuring the
GMSL format accordingly.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>