camera2: follow new 4.4 UI guidelines

powershot button was still ICS blue...changed to white

Change-Id: Ic4c813de047a5bd84ed1bb3b124fa2b7d0ca064d
camera2: update to new 4.4 KitKat UI

thanks kroz

Change-Id: Ibac9681e53660bb727c2419f06b5b5509ebe169c