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/libmediaplayerservice/MediaPlayerService.cpp b/media/libmediaplayerservice/MediaPlayerService.cpp
index af58cac..a0c20ae 100644
--- a/media/libmediaplayerservice/MediaPlayerService.cpp
+++ b/media/libmediaplayerservice/MediaPlayerService.cpp
@@ -1010,7 +1010,7 @@
     return p->reset();
 }
 
-status_t MediaPlayerService::Client::setAudioStreamType(int type)
+status_t MediaPlayerService::Client::setAudioStreamType(audio_stream_type_t type)
 {
     ALOGV("[%d] setAudioStreamType(%d)", mConnId, type);
     // TODO: for hardware output, call player instead