Revert "stagefright: 24-bit audio support via offloading"

This reverts commit 528c8832ee1195e513ef19ffccba99877be50fe3.

Conflicts:
	media/libstagefright/FLACExtractor.cpp
	media/libstagefright/Utils.cpp
	media/libstagefright/WAVExtractor.cpp

	modified:   media/libstagefright/AudioPlayer.cpp
	modified:   media/libstagefright/FLACExtractor.cpp
	modified:   media/libstagefright/Utils.cpp
	modified:   media/libstagefright/WAVExtractor.cpp