sched: improve the scheduler

This change is for general scheduler improvement.

CRs-Fixed: 2040904
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
[markivx: Retain only core_ctl and boost changes]
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>

Change-Id: I3f0ce1ca51fbe504e7b6f6cca0e6e25ef135e473
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>