usb: speedtch: 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/atm/speedtch.c

@@ -737,7 +737,7 @@ static int speedtch_post_reset(struct usb_interface *intf)
 **  USB  **
 **********/
 
-static struct usb_device_id speedtch_usb_ids[] = {
+static const struct usb_device_id speedtch_usb_ids[] = {
 	{USB_DEVICE(0x06b9, 0x4061)},
 	{}
 };