Perf: Add boost for scroller(horizontal scroll use cases)

Use perflock api's to add cpu boost for
start scroller. 2 Cores are made online
with minumum 1.1GHz nominal cpu freq for the
duration of the scroll.
Cpu boost will be controlled by
config_enableCpuBoostForScroller.
Default value of config is false and to turn
on use device specific overlay files.
Disabled KSM during scroll

Change-Id: I2dc61f1385878ba2da6544d2f1cfc6a356fb41ba