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>

drivers/gpu/drm/mediatek/mtk_drm_drv.c

@@ -288,6 +288,7 @@ static const struct mtk_mmsys_driver_data mt8186_mmsys_driver_data = {
 static const struct mtk_mmsys_driver_data mt8188_vdosys0_driver_data = {
 	.main_path = mt8188_mtk_ddp_main,
 	.main_len = ARRAY_SIZE(mt8188_mtk_ddp_main),
+	.mmsys_dev_num = 1,
 };
 
 static const struct mtk_mmsys_driver_data mt8192_mmsys_driver_data = {