arm64: dts: mt8183: Add port node to mt8183.dtsi

Add the port node to fix the binding schema check. Also update
mt8183-kukui to reference the new port node.

Fixes: 88ec8402 ("arm64: dts: mt8183: Add dsi node")
Fixes: 27eaf34d ("arm64: dts: mt8183: config dsi node")
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Link: https://lore.kernel.org/r/20250423040354.2847447-1-treapking@chromium.org


Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>