drm/mediatek: Add mmsys_dev_num to mt8188 vdosys0 driver data

Add missing mmsys_dev_num to mt8188 vdosys0 driver data.

Fixes: 54b48080 ("drm/mediatek: Add mediatek-drm of vdosys0 support for mt8188")
Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Fei Shao <fshao@chromium.org>
Tested-by: Fei Shao <fshao@chromium.org>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20231004024013.18956-2-jason-jh.lin@mediatek.com/


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