serial: mxs: Constify platform_device_id

The platform_device_id is not modified by the driver and core uses it as
const.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/mxs-auart.c

@@ -169,7 +169,7 @@ struct mxs_auart_port {
 	bool			ms_irq_enabled;
 };
 
-static struct platform_device_id mxs_auart_devtype[] = {
+static const struct platform_device_id mxs_auart_devtype[] = {
 	{ .name = "mxs-auart-imx23", .driver_data = IMX23_AUART },
 	{ .name = "mxs-auart-imx28", .driver_data = IMX28_AUART },
 	{ /* sentinel */ }