watchdog: Fix module autoload for OF platform driver

These platform drivers have a OF device ID table but the OF module
alias information is not created so module autoloading won't work.

Signed-off-by: Luis de Bethencourt <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/gef_wdt.c

···
 	},
 	{},
 };
+MODULE_DEVICE_TABLE(of, gef_wdt_ids);
 
 static struct platform_driver gef_wdt_driver = {
 	.driver = {

drivers/watchdog/mena21_wdt.c

···
 	{ .compatible = "men,a021-wdt" },
 	{ },
 };
+MODULE_DEVICE_TABLE(of, a21_wdt_ids);
 
 static struct platform_driver a21_wdt_driver = {
 	.probe = a21_wdt_probe,

drivers/watchdog/moxart_wdt.c

···
 	{ .compatible = "moxa,moxart-watchdog" },
 	{ },
 };
+MODULE_DEVICE_TABLE(of, moxart_watchdog_match);
 
 static struct platform_driver moxart_wdt_driver = {
 	.probe      = moxart_wdt_probe,