[media] uvcvideo: Add bayer 8-bit patterns to uvcvideo

Add bayer 8-bit GUIDs to uvcvideo and associated them with the
corresponding V4L2 pixel formats.

Signed-off-by: Edgar Thier <info@edgarthier.net>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>