MAINTAINERS: sort ordering

Seems we have various confused entries around S and T.  Sort them all out and
also add myself as tty maintainer (which is how I noticed it).

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>