sched: Port boost setting mechanisms to EAS

This patch brings in the ability to set or unset scheduler boost
and have that reflect in the various cgroups/core control state.
It does not contain any changes to task placement or frequency
guidance. Those will be brought in as part of subsequent patches.

Change-Id: Idf59c2f7426416a4248881e5baf63059b1253e75
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>