Suspend MAINTAINERS update

I guess it is time to clarify that suspend and hibernation are separate
things, and add Rafael as a maintainer.  Plus, people blame us for suspend
problems, anyway, I guess it is fair to mark us as suspend maintainers,
too.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Acked-by: Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>