Use audio_policy_output_flags_t consistently

This affects:
 - IAudioFlinger::openOutput
 - AudioTrack::AudioTrack
 - AudioTrack::set
 - apps that call these

Change-Id: I26fb281bac6cb87593d17697bc9cb37a835af205
diff --git a/media/libstagefright/AudioPlayer.cpp b/media/libstagefright/AudioPlayer.cpp
index 2b3cb1a..23c3c74 100644
--- a/media/libstagefright/AudioPlayer.cpp
+++ b/media/libstagefright/AudioPlayer.cpp
@@ -151,7 +151,7 @@
 
         mAudioTrack = new AudioTrack(
                 AUDIO_STREAM_MUSIC, mSampleRate, AUDIO_FORMAT_PCM_16_BIT, audioMask,
-                0, 0, &AudioCallback, this, 0);
+                0, AUDIO_POLICY_OUTPUT_FLAG_NONE, &AudioCallback, this, 0);
 
         if ((err = mAudioTrack->initCheck()) != OK) {
             delete mAudioTrack;