MAINTAINERS: Add Tetsuyuki Kobayshi for kzm9g

Signed-off-by: Tetsuyuki Kobayashi <koba@kmckk.co.jp>
diff --git a/MAINTAINERS b/MAINTAINERS
index 200426e..62b013f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1007,6 +1007,7 @@
 	SMDK6400	ARM1176 (S3C6400 SoC)
 
 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
+Tetsuyuki Kobayashi <koba@kmckk.co.jp>
 
 	kzm9g	SH73A0 (RMOBILE SoC)