av: merge qcom CAF kk_2.7_rb18

Change-Id: If98500d59270b1b8042825053b2015da8fe97af8

Conflicts:
	media/libstagefright/Android.mk
	media/libstagefright/AudioPlayer.cpp
	media/libstagefright/DataSource.cpp
	media/libstagefright/ExtendedCodec.cpp
	media/libstagefright/ExtendedExtractor.cpp
	media/libstagefright/ExtendedUtils.cpp
	media/libstagefright/OMXCodec.cpp
	media/libstagefright/include/ExtendedExtractor.h
	services/audioflinger/Effects.cpp
	services/audioflinger/Threads.cpp