Update the maintenance status for m32r

- Removing Hirokazu Takata as maintainer
  (last commit merged: Nov. 2009)

- Remove mailing lists that no longer exist,
  as the ml.linux-m32r.org subdomain no longer exists.

- Maintenance status moved to "Orphan"
Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com>
Acked-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>