usb: gadget: epautoconf: switch over to usb_endpoint_type()

we have a helper to fetch endpoint type out of
a descriptor, let's use it.
Signed-off-by: NFelipe Balbi <balbi@ti.com>

drivers/usb/gadget/epautoconf.c

@@ -58,7 +58,7 @@ ep_matches (
 		return 0;
 
 	/* only support ep0 for portable CONTROL traffic */
-	type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+	type = usb_endpoint_type(desc);
 	if (USB_ENDPOINT_XFER_CONTROL == type)
 		return 0;