This updates MAINTAINERS for sh/sh64 to match up with the 2.4 entries.

I've also removed NIIBE-san as an active sh maintainer, since he hasn't
been involved or submitted any code since 2002/06/26.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>