sched/fair: Add bias towards previous CPU for high wakeup rate tasks

Skip the CPU selection algorithm for high wakeup rate tasks and select
the previous CPU if it is idle.

Change-Id: I99493c8c37e091c79723ee22a5230fbb6f4e33b9
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>