usb: gadget: fsl_qe_udc: constify qe_ep0_desc

qe_ep0_desc is only passed as the second argument to qe_ep_init, which is
const, so qe_ep0_desc can be const too.

Done with the help of Coccinelle.
Acked-by: NLi Yang <leoyang.li@nxp.com>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/gadget/udc/fsl_qe_udc.c

@@ -62,7 +62,7 @@ static const char *const ep_name[] = {
 	"ep3",
 };
 
-static struct usb_endpoint_descriptor qe_ep0_desc = {
+static const struct usb_endpoint_descriptor qe_ep0_desc = {
 	.bLength =		USB_DT_ENDPOINT_SIZE,
 	.bDescriptorType =	USB_DT_ENDPOINT,