Revert "NuPlayer: use video hardware codec only"

This reverts commit 845654328e0a9b81c436bb65d51119deba84a167.

	modified:   media/libmediaplayerservice/nuplayer/NuPlayer.cpp
	modified:   media/libmediaplayerservice/nuplayer/NuPlayer.h
	modified:   media/libstagefright/ACodec.cpp