Use new channel count functions for audio masks

Change-Id: Ia658ab4b6320d19fdb50f123c930918724ff0ef3
Signed-off-by: Andy Hung <hunga@google.com>
diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index aaaa3f1..b4d6d76 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -290,7 +290,7 @@
         return BAD_VALUE;
     }
     mChannelMask = channelMask;
-    uint32_t channelCount = popcount(channelMask);
+    uint32_t channelCount = audio_channel_count_from_out_mask(channelMask);
     mChannelCount = channelCount;
 
     // AudioFlinger does not currently support 8-bit data in shared memory