exynos4: update media headers

Change-Id: Ia6221554d290c46f11c68e276dda41c8ebe3a7ab
exynos3: power: Tuning and cleanups

* Tune the governor for better power usage and interactivity
* Reset tuning parameters if governor changes
* Cleanup

Change-Id: Ibe60ece836a0e56ba58e109bbea26cbd54d75421