Enable fast track for SoundPool

Change-Id: Ia80b3a7738e4c5dbe2bd5b0f55f0ca49943e2f64
diff --git a/media/libmedia/SoundPool.cpp b/media/libmedia/SoundPool.cpp
index 4b318ed..abc8899 100644
--- a/media/libmedia/SoundPool.cpp
+++ b/media/libmedia/SoundPool.cpp
@@ -611,7 +611,7 @@
                 channels, sample->getIMemory(), AUDIO_OUTPUT_FLAG_NONE, callback, userData);
 #else
         newTrack = new AudioTrack(streamType, sampleRate, sample->format(),
-                channels, frameCount, AUDIO_OUTPUT_FLAG_NONE, callback, userData,
+                channels, frameCount, AUDIO_OUTPUT_FLAG_FAST, callback, userData,
                 bufferFrames);
 #endif
         oldTrack = mAudioTrack;