enable qcom a/v enhancements

Change-Id: I7fbd34484610ee2be4aa6ee35b5151db657ce270
remove USE_CAMERA_STUB and inherit from vendor

Change-Id: Ibe57f6b7bcee356c23b556347c69cff76bb2bb46
remove unused bionic optimization flags

Change-Id: Ibe09b30406a223ffe67a41157f55a5369c9608e0
media_codecs: update for 4.3

Change-Id: If40ffc4102c2e5eb946998597adacbefa28256f7