Revert "PM / Sleep: Do not check wakeup too often in try_to_freeze_tasks()"

This reverts commit 02278deee7eb635943d353874fd72182160a3997.
Revert "tick-sched: change the cpu that updates rq_stats"

This reverts commit fe317ca17b6970f6cca94437404de5b906e4180a.