watchdog: imx2_wdt: expose module alias for loading from device-tree

Enable auto loading by udev when imx2_wdt is compiled as a module.

Signed-off-by: Niels de Vos <[e-mail]>
Acked-by: Shawn Guo <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/imx2_wdt.c

···
 	{ .compatible = "fsl,imx21-wdt", },
 	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, imx2_wdt_dt_ids);
 
 static struct platform_driver imx2_wdt_driver = {
 	.remove		= __exit_p(imx2_wdt_remove),