mfd: hi6421-pmic: 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/hi6421-pmic-core.c

@@ -97,6 +97,7 @@ static const struct of_device_id of_hi6421_pmic_match_tbl[] = {
 	{ .compatible = "hisilicon,hi6421-pmic", },
 	{ },
 };
+MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match_tbl);
 
 static struct platform_driver hi6421_pmic_driver = {
 	.driver = {