Make the global alpha multiplier of VSP planes configurable through the
alpha property, exactly as for the native DU planes.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: NDave Airlie <airlied@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>