These changes add the powerhal support to detect
camera preview hint and perform power optimization
in cpu, scheduler.
Change-Id: Ibd7bd1c341a86004dc736aba6a634d6206da8564
Process video decode hints and display-off hints
in the power HAL. Also move to using the perflock
API to request system-level parameter changes.
Change-Id: I42e33d6d22016b02d85572a69fee64aadf36da58