HID: intel-ish-hid: Constify lowlevel HID driver

Since commit 52d22534 ("HID: Make lowlevel driver structs const")
the lowlevel HID drivers are only exposed as const.

Take advantage of this to constify the underlying structure, too.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230130-hid-const-ll-driver-v1-5-3fc282b3b1d0@weissschuh.netSigned-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

drivers/hid/intel-ish-hid/ishtp-hid.c

@@ -183,7 +183,7 @@ void ishtp_hid_wakeup(struct hid_device *hid)
 	wake_up_interruptible(&hid_data->hid_wait);
 }
 
-static struct hid_ll_driver ishtp_hid_ll_driver = {
+static const struct hid_ll_driver ishtp_hid_ll_driver = {
 	.parse = ishtp_hid_parse,
 	.start = ishtp_hid_start,
 	.stop = ishtp_hid_stop,