Since I didn't know about the linux-mm mailing list until I spammed all
those that had their names anywhere in the mm directory, I'm sending this
patch to add the linux-mm mailing list to the MAINTAINERS file.

Also, since mm is so broad, it doesn't have a single person to maintain it,
and thus no maintainer is listed.  I also left the status as Maintained,
since it obviously is.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>