Rename UNITY_GAIN to UNITY_GAIN_INT in AudioMixer

Change-Id: Ic040311305026f0b4c4280a5b3bef7a447ac1da3
diff --git a/services/audioflinger/Tracks.cpp b/services/audioflinger/Tracks.cpp
index 7ddc71c..64ae0b0 100644
--- a/services/audioflinger/Tracks.cpp
+++ b/services/audioflinger/Tracks.cpp
@@ -1873,7 +1873,7 @@
         mResampler = AudioResampler::create(16, thread->mChannelCount, sampleRate);
         // source SR
         mResampler->setSampleRate(thread->mSampleRate);
-        mResampler->setVolume(AudioMixer::UNITY_GAIN, AudioMixer::UNITY_GAIN);
+        mResampler->setVolume(AudioMixer::UNITY_GAIN_INT, AudioMixer::UNITY_GAIN_INT);
         mResamplerBufferProvider = new ResamplerBufferProvider(this);
     }
 }