rtc: Fix module autoload for OF platform drivers

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: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
index 30c926b..06a5c52 100644
--- a/drivers/rtc/rtc-mt6397.c
+++ b/drivers/rtc/rtc-mt6397.c
@@ -402,6 +402,7 @@
 	{ .compatible = "mediatek,mt6397-rtc", },
 	{ }
 };
+MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);
 
 static struct platform_driver mtk_rtc_driver = {
 	.driver = {