soc: mediatek: mmsys: add comp OVL_2L2/POSTMASK/RDMA4

This patch add some more ddp component
OVL_2L2 is ovl which include 2 layers overlay
POSTMASK control round corner for display frame
RDMA4 read dma buffer

Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Link: https://lore.kernel.org/r/1627894773-23872-2-git-send-email-yongqiang.niu@mediatek.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>