linux-phytec-ti

drm/bridge: cdns-mhdp: Get rid of redundant enum pixel_format

The enum pixel_format is quite redundant as its literal values are not
used as such anywhere. We can just as well use DRM_COLOR_FORMAT_*
definitions. However, the currently unsupported monochrome (Y_ONLY)
format needs to be handled separately.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>