Change VoIP channel masks to dynamic

 * Should fix VoIP issues

Change-Id: I3aad2dc825836da628873db52410af2414884100
Enable TARGET_VIDEO_PREVIEW_ALWAYS_MAX for camera HAL

 * Might be needed for 3rd party apps, so move it into HAL

Change-Id: I560a3101ea20780eca501c9f5cbcdbb7c7c0a907