arm64: dts: mediatek: mt8186: Add display nodes

Add display nodes and the GCE (Global Command Engine) properties
to the display nodes in order to enable the usage of the CMDQ
(Command Queue), which is required for operating the display.

Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230324021258.15863-7-allen-kh.cheng@mediatek.com


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