usb: udc: lpc32xx: silence fall-through warning

Silence the following fall-through warning by adding a break statement:

drivers/usb/gadget/udc/lpc32xx_udc.c:2230:3: warning: this statement may
fall through [-Wimplicit-fallthrough=]
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Link: https://lore.kernel.org/r/20190821021627.GA2679@embeddedorSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/udc/lpc32xx_udc.c

@@ -2265,7 +2265,7 @@ static void udc_handle_ep0_setup(struct lpc32xx_udc *udc)
 		default:
 			break;
 		}
-
+		break;
 
 	case USB_REQ_SET_ADDRESS:
 		if (reqtype == (USB_TYPE_STANDARD | USB_RECIP_DEVICE)) {