audioflinger: Power hints for audio activity

 * Take 2, now with 100% less crashes!

Change-Id: I48fb0d2e3cfc64f46d99f177b4cf3fe842d06df4
libstagefright: Handle offload fallback for WAV content

- For WAV content there is no OMX Source, use the AudioTrack
  as OMX Source for fallback.

Change-Id: Ifeaeb2cf8dd777d167b74eebd11803b7f130e857

Conflicts:
	media/libstagefright/AwesomePlayer.cpp