drm: rcar-du: Add new formats (2-10-10-10 ARGB, Y210)

Add new pixel formats: RGBX1010102, RGBA1010102, ARGB2101010, Y210 and
Y212.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>