dt-bindings: display: mediatek: dpi: add compatible for MT8365

Add dt-binding documentation of dpi for MediaTek MT8365 SoC.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20231023-display-support-v4-7-ed82eb168fb1@baylibre.com/


Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>