Use audio_stream_type_t consistently

At native level it was a mixture of audio_stream_type_t, int, uint32_t,
and uint8_t.  Java is still int.  Also fixed a couple of hard-coded -1
instead of AUDIO_STREAM_DEFAULT, and in startToneCommand a hard-coded 0
instead of AUDIO_STREAM_VOICE_CALL.

Change-Id: Ia33bfd70edca8c2daec9052984b369cd8eee2a83
diff --git a/include/media/MediaPlayerInterface.h b/include/media/MediaPlayerInterface.h
index 1f6bdda..7beb176 100644
--- a/include/media/MediaPlayerInterface.h
+++ b/include/media/MediaPlayerInterface.h
@@ -199,7 +199,7 @@
     virtual             ~MediaPlayerHWInterface() {}
     virtual bool        hardwareOutput() { return true; }
     virtual status_t    setVolume(float leftVolume, float rightVolume) = 0;
-    virtual status_t    setAudioStreamType(int streamType) = 0;
+    virtual status_t    setAudioStreamType(audio_stream_type_t streamType) = 0;
 };
 
 }; // namespace android