sched: introduce sched_{up,down}migrate knobs

Introduce knobs sched_upmigrate and sched_downmigrate to
control thresholds to up and down migrate tasks between clusters at a
runtime for ease of power and performance tuning.

Change-Id: I17a464388b404b61d9a9dbe1beee4883c4db8e3f
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
[satyap@codeaurora.org: resolve merge conflicts & update
functinality as needed on msm-4.14]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>