sched: Improve the scheduler

This change is for general scheduler improvement.

Change-Id: Ia43c01e7e368186399b9d021a6761545c7da0c18
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
[satyap@codeaurora.org: fix trivial merge conflict]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>