Revert "sched: Reduce overestimating rq->avg_idle"

This reverts commit e79bb722fe2ea05839a3b5bf24af963853dea973.
Revert "sched/fair: Optimize cgroup pick_next_task_fair()"

This reverts commit 0000de175fc3fb665110ed2b76a4ff1c9b7f19c2.
Revert "sched/fair: Optimize find_busiest_queue()"

This reverts commit 0905703cea65f188d100fc11f013fc99a76c8322.
Revert "sched: Micro-optimize the smart wake-affine logic"

This reverts commit 3a5adca42808f19c9a4ddad529b6858de483d62f.
Revert "sched: Implement smarter wake-affine logic"

This reverts commit 8d6810f84742b8f151d82b7806d4a59b88018b4d.