drm/mediatek: mtk_dsi: Remove spurious drm_connector_unregister

Connectors are unregistered by mtk_drm_drv via drm_connector_unregister_all().

Signed-off-by: Philipp Zabel <[e-mail]>

drivers/gpu/drm/mediatek/mtk_dsi.c

···
 {
 	drm_encoder_cleanup(&dsi->encoder);
 	/* Skip connector cleanup if creation was delegated to the bridge */
-	if (dsi->conn.dev) {
-		drm_connector_unregister(&dsi->conn);
+	if (dsi->conn.dev)
 		drm_connector_cleanup(&dsi->conn);
-	}
 }
 
 static void mtk_dsi_ddp_start(struct mtk_ddp_comp *comp)