drm/mediatek: Add MT8186 DSI compatible for mtk_drm_drv.c

The compatible "mediatek,mt8186-dsi" is used by MT8186 DSI, so
add it to mtk_ddp_comp_dt_ids in mtk_drm_drv.c.

Link: https://patchwork.kernel.org/project/linux-mediatek/patch/[e-mail]/
Signed-off-by: Rex-BC Chen <[e-mail]>
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Signed-off-by: Chun-Kuang Hu <[e-mail]>

drivers/gpu/drm/mediatek/mtk_drm_drv.c

···
 	  .data = (void *)MTK_DSI },
 	{ .compatible = "mediatek,mt8183-dsi",
 	  .data = (void *)MTK_DSI },
+	{ .compatible = "mediatek,mt8186-dsi",
+	  .data = (void *)MTK_DSI },
 	{ }
 };