cgroups: timer_slack: forward port timer_slack to 3.4. http://lwn.net/Articles/431847/

Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
mako_hotplug/load_stats: remove unused code from the load_stats driver. Queue the delayed work every 0,5s and not every 0,1s.

Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>