Remove redundant stop() from native audiotrack release.

Support for ReleaseJavaProxy() semantics in Wilhelm IAndroidConfiguration.

Bug: 23899814
Change-Id: Iaa29b950c02b30d3a1a4621bd9c2fc62361e48d6
diff --git a/core/jni/android_media_AudioTrack.cpp b/core/jni/android_media_AudioTrack.cpp
index 660cbdc..302cf63 100644
--- a/core/jni/android_media_AudioTrack.cpp
+++ b/core/jni/android_media_AudioTrack.cpp
@@ -541,7 +541,6 @@
         return;
     }
     //ALOGV("deleting lpTrack: %x\n", (int)lpTrack);
-    lpTrack->stop();
 
     // delete the JNI data
     AudioTrackJniStorage* pJniStorage = (AudioTrackJniStorage *)env->GetLongField(