usb: isp1760: udc: add missing usb_ep_set_maxpacket_limit()

Since maxpacket_limit was introduced all UDC drivers should use
usb_ep_set_maxpacket_limit() function instead of setting maxpacket value
manually. ep.maxpacket_limit contains actual maximum maxpacket value
supported by hardware which is needed by epautoconf.
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/isp1760/isp1760-udc.c

@@ -1382,11 +1382,11 @@ static void isp1760_udc_init_eps(struct isp1760_udc *udc)
 		 * This fits in the 8kB FIFO without double-buffering.
 		 */
 		if (ep_num == 0) {
-			ep->ep.maxpacket = 64;
+			usb_ep_set_maxpacket_limit(&ep->ep, 64);
 			ep->maxpacket = 64;
 			udc->gadget.ep0 = &ep->ep;
 		} else {
-			ep->ep.maxpacket = 512;
+			usb_ep_set_maxpacket_limit(&ep->ep, 512);
 			ep->maxpacket = 0;
 			list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
 		}