Move control block mName to createTrack() output

This is part of a series of CLs to clean up the shared memory
control block, by removing any fields that don't have to be there.

Change-Id: I6e51003a1293b6800258c31b22cff2eba42162e7
diff --git a/media/libmedia/AudioTrackShared.cpp b/media/libmedia/AudioTrackShared.cpp
index 5015b8d..3b7616f 100644
--- a/media/libmedia/AudioTrackShared.cpp
+++ b/media/libmedia/AudioTrackShared.cpp
@@ -27,7 +27,7 @@
 
 audio_track_cblk_t::audio_track_cblk_t()
     : mServer(0), frameCount_(0), mFutex(0), mMinimum(0),
-    mVolumeLR(0x10001000), mSampleRate(0), mSendLevel(0), mName(0), mFlags(0)
+    mVolumeLR(0x10001000), mSampleRate(0), mSendLevel(0), mFlags(0)
 {
     memset(&u, 0, sizeof(u));
 }