usb: gadget: amd5536udc: convert to udc_start/udc_stop

Mechanical change making use of the new (can we
still call it new ?) interface for registering
UDC drivers.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/amd5536udc.h b/drivers/usb/gadget/amd5536udc.h
index 14af87d..f1bf32e 100644
--- a/drivers/usb/gadget/amd5536udc.h
+++ b/drivers/usb/gadget/amd5536udc.h
@@ -563,6 +563,8 @@
 	u16				cur_alt;
 };
 
+#define to_amd5536_udc(g)	(container_of((g), struct udc, gadget))
+
 /* setup request data */
 union udc_setup_data {
 	u32			data[2];