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/media/libmedia/mediaplayer.cpp b/media/libmedia/mediaplayer.cpp
index 4be960c..acf97a6 100644
--- a/media/libmedia/mediaplayer.cpp
+++ b/media/libmedia/mediaplayer.cpp
@@ -478,7 +478,7 @@
     return reset_l();
 }
 
-status_t MediaPlayer::setAudioStreamType(int type)
+status_t MediaPlayer::setAudioStreamType(audio_stream_type_t type)
 {
     ALOGV("MediaPlayer::setAudioStreamType");
     Mutex::Autolock _l(mLock);