Set channel mask when opening audio sink

Update the code to use the AudioSink::open() interface that
 takes a channel mask as an additional parameter. The code
 is only stereo, and returns an error when attempting to create
 a video editor audio sink with more than two channels.

Change-Id: Ib9bba067da0b286c08656976b89fba7c8b42f99f
diff --git a/libvideoeditor/lvpp/VideoEditorAudioPlayer.cpp b/libvideoeditor/lvpp/VideoEditorAudioPlayer.cpp
index 219b849..66800ea 100755
--- a/libvideoeditor/lvpp/VideoEditorAudioPlayer.cpp
+++ b/libvideoeditor/lvpp/VideoEditorAudioPlayer.cpp
@@ -511,7 +511,7 @@
 
     if (mAudioSink.get() != NULL) {
         status_t err = mAudioSink->open(
-                mSampleRate, numChannels, AUDIO_FORMAT_PCM_16_BIT,
+                mSampleRate, numChannels, CHANNEL_MASK_USE_CHANNEL_ORDER, AUDIO_FORMAT_PCM_16_BIT,
                 DEFAULT_AUDIOSINK_BUFFERCOUNT,
                 &VideoEditorAudioPlayer::AudioSinkCallback, this);
         if (err != OK) {