Revert "kernel: cgroup_timer_slack: Adaptations for 3.4 kernel"

This reverts commit 5b35fe61ae239087be54110f3833dce4eb83f2b0.
Revert "cgroups: timer_slack: forward port timer_slack to 3.4. http://lwn.net/Articles/431847/"

This reverts commit 7b9e4e04dc38f4828a06b985433f63ea1435a14c.

Signed-off-by: Chester Kener <Cl3Kener@gmail.com>

Conflicts:
	include/linux/cgroup_subsys.h