sh: Add myself as SH maintainer

Add myself as an SH maintainer.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Cc: Tom Rini <trini@konsulko.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index ca32d7e..c0a70c5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -701,6 +701,7 @@
 F:	arch/sandbox/
 
 SH
+M:	Marek Vasut <marek.vasut+renesas@gmail.com>
 M:	Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
 S:	Maintained
 T:	git git://git.denx.de/u-boot-sh.git