sched: Improve the scheduler

This change is for general scheduler improvement.

Change-Id: Ib93a77c1d12574354213a37b1171a462b7cab685
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>