mwifiex: constify usb_device_id

usb_device_id are not supposed to change at runtime. All functions
working with usb_device_id provided by <linux/usb.h> work with
const usb_device_id. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/usb.c

@@ -24,7 +24,7 @@
 
 static struct mwifiex_if_ops usb_ops;
 
-static struct usb_device_id mwifiex_usb_table[] = {
+static const struct usb_device_id mwifiex_usb_table[] = {
 	/* 8766 */
 	{USB_DEVICE(USB8XXX_VID, USB8766_PID_1)},
 	{USB_DEVICE_AND_INTERFACE_INFO(USB8XXX_VID, USB8766_PID_2,