mfd: sm501: Fix module autoload for OF platform driver

This platform driver has 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 <luisbg@osg.samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/sm501.c

@@ -1719,6 +1719,7 @@ static const struct of_device_id of_sm501_match_tbl[] = {
 	{ .compatible = "smi,sm501", },
 	{ /* end */ }
 };
+MODULE_DEVICE_TABLE(of, of_sm501_match_tbl);
 
 static struct platform_driver sm501_plat_driver = {
 	.driver		= {