usb: renesas_usbhs: gadget: make usb_ep_ops const

Make the structure const as it is only stored in the ops field of a
usb_ep structure, which is of type const.
Done using Coccinelle.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/renesas_usbhs/mod_gadget.c

@@ -767,7 +767,7 @@ static int usbhsg_ep_set_wedge(struct usb_ep *ep)
 	return __usbhsg_ep_set_halt_wedge(ep, 1, 1);
 }
 
-static struct usb_ep_ops usbhsg_ep_ops = {
+static const struct usb_ep_ops usbhsg_ep_ops = {
 	.enable		= usbhsg_ep_enable,
 	.disable	= usbhsg_ep_disable,