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>

drivers/usb/gadget/amd5536udc.h

@@ -563,6 +563,8 @@ struct udc {
 	u16				cur_alt;
 };
 
+#define to_amd5536_udc(g)	(container_of((g), struct udc, gadget))
+
 /* setup request data */
 union udc_setup_data {
 	u32			data[2];