drm/imx: parallel-display: detach bridge or panel on unbind

Don't leave any bridge or panel attached to a stale driver instance
when unbinding, to allow reattachment on a rebind.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/gpu/drm/imx/parallel-display.c

@@ -293,6 +293,11 @@ static void imx_pd_unbind(struct device *dev, struct device *master,
 {
 	struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
 
+	if (imxpd->bridge)
+		drm_bridge_detach(imxpd->bridge);
+	if (imxpd->panel)
+		drm_panel_detach(imxpd->panel);
+
 	kfree(imxpd->edid);
 }