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/libmediaplayerservice/MediaPlayerService.cpp b/media/libmediaplayerservice/MediaPlayerService.cpp
index 1a85c9c..bbc53f3 100644
--- a/media/libmediaplayerservice/MediaPlayerService.cpp
+++ b/media/libmediaplayerservice/MediaPlayerService.cpp
@@ -1503,7 +1503,7 @@
                 format,
                 channelMask,
                 frameCount,
-                0 /* flags */,
+                AUDIO_POLICY_OUTPUT_FLAG_NONE,
                 CallbackWrapper,
                 this,
                 0,
@@ -1515,7 +1515,7 @@
                 format,
                 channelMask,
                 frameCount,
-                0,
+                AUDIO_POLICY_OUTPUT_FLAG_NONE,
                 NULL,
                 NULL,
                 0,