arm64: dts: mt8183: Add port node to dpi node

Add the port node to fix the binding schema check.

Fixes: 009d855a ("arm64: dts: mt8183: add dpi node to mt8183")
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409110843.Hm5W9upr-lkp@intel.com/
Link: https://lore.kernel.org/r/20240912144430.3161717-3-treapking@chromium.org


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