musb: Update usb-compat to work with struct usb_device without a parent ptr

When building with CONFIG_DM_USB=y struct usb_device does not have a parent
pointer. This commit adds support to the musb code to deal with this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/usb/musb-new/musb_host.c b/drivers/usb/musb-new/musb_host.c
index 437309c..40b9c66 100644
--- a/drivers/usb/musb-new/musb_host.c
+++ b/drivers/usb/musb-new/musb_host.c
@@ -2067,7 +2067,11 @@
 
 	/* precompute addressing for external hub/tt ports */
 	if (musb->is_multipoint) {
+#ifndef __UBOOT__
 		struct usb_device	*parent = urb->dev->parent;
+#else
+		struct usb_device	*parent = usb_dev_get_parent(urb->dev);
+#endif
 
 #ifndef __UBOOT__
 		if (parent != hcd->self.root_hub) {