MAINTAINERS: sh: update the mailing list

Signed-off-by: Adrian Bunk <bunk@stusta.de>

MAINTAINERS

@@ -2487,7 +2487,7 @@ P:	Paul Mundt
 M:	lethal@linux-sh.org
 P:	Kazumoto Kojima
 M:	kkojima@rr.iij4u.or.jp
-L:	linux-sh@m17n.org
+L:	linuxsh-dev@lists.sourceforge.net
 W:	http://www.linux-sh.org
 W:	http://www.m17n.org/linux-sh/
 W:	http://www.rr.iij4u.or.jp/~kkojima/linux-sh4.html