Configure policy of mediaserver threads

Change-Id: Ifd825590ba36996064a458f64453a94b84722cb0
diff --git a/include/media/IAudioTrack.h b/include/media/IAudioTrack.h
index 577b095..9e0e389 100644
--- a/include/media/IAudioTrack.h
+++ b/include/media/IAudioTrack.h
@@ -39,10 +39,9 @@
     virtual sp<IMemory> getCblk() const = 0;
 
     /* After it's created the track is not active. Call start() to
-     * make it active. If set, the callback will start being called.
-     * tid identifies the client callback thread, or 0 if not needed.
+     * make it active.
      */
-    virtual status_t    start(pid_t tid) = 0;
+    virtual status_t    start() = 0;
 
     /* Stop a track. If set, the callback will cease being called and
      * obtainBuffer will return an error. Buffers that are already released