MAINTAINERS: add Mediatek RTC driver

Add Mediatek RTC driver to maintainer entry.

Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index d8afd29..8fc34fa 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1236,6 +1236,13 @@
 S:	Maintained
 F:	arch/arm/mach-orion5x/ts78xx-*
 
+ARM/Mediatek RTC DRIVER
+M:	Eddie Huang <eddie.huang@mediatek.com>
+L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+L:	linux-mediatek@lists.infradead.org (moderated for non-subscribers)
+S:	Maintained
+F:	drivers/rtc/rtc-mt6397.c
+
 ARM/Mediatek SoC support
 M:	Matthias Brugger <matthias.bgg@gmail.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)