Added reference implementation of suspend and resume routines.

From: Shaohua Li <shaohua.li@intel.com>

  build fix
Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>