Revert "sched: Improve scalability via CPU buddies"

This reverts commit dc1c2a79570e44e3098eae7a2e020bec9ba5133a.
Revert "sched/nohz: Fix rq->cpu_load calculations some more"

This reverts commit 4b741549d95cf39cb355b094cb78ed08644b3ab3.
Revert "sched/nohz: Fix rq->cpu_load calculations"

This reverts commit f9df40c46da1876370683cc921c89f93936b363c.
Revert "sched: Change rq->nr_running to unsigned int"

This reverts commit a99a31f32f59d4ec22641dcd296ae479c08f4e05.
Revert "sched.fair improve the group logic"

This reverts commit b9cd6697fe250be263add20bee4494506e20f627.
Revert "sched: Fix nohz_idle_balance"

This reverts commit 8651e46dda9049d852b0cc934e00bb8a41aa142a.
Revert "sched: fix init NOHZ_IDLE flag"

This reverts commit 4f2d23add4fefada17050bcdf81edde8696f9612.