MAINTAINERS: Update dlm mailing list

The new gfs2@ list will also be used for dlm development.
Signed-off-by: Andrew Price <anprice@redhat.com>
Acked-by: David Teigland <teigland@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

MAINTAINERS

@@ -6092,7 +6092,7 @@ F:	include/video/udlfb.h
 DISTRIBUTED LOCK MANAGER (DLM)
 M:	Christine Caulfield <ccaulfie@redhat.com>
 M:	David Teigland <teigland@redhat.com>
-L:	cluster-devel@redhat.com
+L:	gfs2@lists.linux.dev
 S:	Supported
 W:	http://sources.redhat.com/cluster/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm.git