usb: gadget: lpc32xx_udc: Make of_device_id array const

Make of_device_id array const, because all OF functions handle
it as const.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/lpc32xx_udc.c b/drivers/usb/gadget/lpc32xx_udc.c
index e471580..c77c687 100644
--- a/drivers/usb/gadget/lpc32xx_udc.c
+++ b/drivers/usb/gadget/lpc32xx_udc.c
@@ -3397,7 +3397,7 @@
 #endif
 
 #ifdef CONFIG_OF
-static struct of_device_id lpc32xx_udc_of_match[] = {
+static const struct of_device_id lpc32xx_udc_of_match[] = {
 	{ .compatible = "nxp,lpc3220-udc", },
 	{ },
 };