Revert "sched/cpuidle: reduce IPI storm. Backport upstream 3.16 scheduler updates"

This reverts commit 5cc3600069b9a92213c588fbafe4414f3e345b8a.
sched/cpuidle: reduce IPI storm. Backport upstream 3.16 scheduler updates (reverted from commit 5cc3600069b9a92213c588fbafe4414f3e345b8a)