MAINTAINERS: add entry for MediaTek Random Number Generator

I work for MediaTek on maintaining the MediaTek RNG driver
for the existing SoCs and adding support for the following
SoCs.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/MAINTAINERS b/MAINTAINERS
index 1f20176..8d64b89 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8267,6 +8267,11 @@
 S:	Maintained
 F:	drivers/net/wireless/mediatek/mt7601u/
 
+MEDIATEK RANDOM NUMBER GENERATOR SUPPORT
+M:      Sean Wang <sean.wang@mediatek.com>
+S:      Maintained
+F:      drivers/char/hw_random/mtk-rng.c
+
 MEGACHIPS STDPXXXX-GE-B850V3-FW LVDS/DP++ BRIDGES
 M:	Peter Senna Tschudin <peter.senna@collabora.com>
 M:	Martin Donnelly <martin.donnelly@ge.com>