In platform swsusp mode, we were forgetting to spin disks down, leading to
ugly emergency shutdown.  This synchronizes platform method with other
methods and actually helps.
Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>