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/mediaplayer.h b/include/media/mediaplayer.h
index 2dc055e..00b7dd5 100644
--- a/include/media/mediaplayer.h
+++ b/include/media/mediaplayer.h
@@ -185,7 +185,7 @@
             status_t        getCurrentPosition(int *msec);
             status_t        getDuration(int *msec);
             status_t        reset();
-            status_t        setAudioStreamType(int type);
+            status_t        setAudioStreamType(audio_stream_type_t type);
             status_t        setLooping(int loop);
             bool            isLooping();
             status_t        setVolume(float leftVolume, float rightVolume);
@@ -223,7 +223,7 @@
     int                         mSeekPosition;
     bool                        mPrepareSync;
     status_t                    mPrepareStatus;
-    int                         mStreamType;
+    audio_stream_type_t         mStreamType;
     bool                        mLoop;
     float                       mLeftVolume;
     float                       mRightVolume;