arm64: dts: mediatek: cherry: Configure eDP and internal display

Add the required nodes to enable the DisplayPort interface, connected
to the Embedded DisplayPort port, where we have an internal display.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230816190427.2137768-1-nfraprado@collabora.com


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