Frameworks: CPU boosting Hooks && Interface

Credits to CM
 * Boosts CPU using Power HAL for the given duration.
 * Duration is given in microseconds.
 * Power HAL must implement POWER_HINT_CPU_BOOST.
 * Boost CPU to max during scrolling
 * Boost CPU to max on activity start/resume
 * Inspired by a patch from CodeAuora.

Change-Id: Id50847d9814e9ffc33c09c136406d0a8318bf3db