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/IMediaPlayer.cpp b/media/libmedia/IMediaPlayer.cpp
index 9c1e6b7..64cc919 100644
--- a/media/libmedia/IMediaPlayer.cpp
+++ b/media/libmedia/IMediaPlayer.cpp
@@ -198,11 +198,11 @@
         return reply.readInt32();
     }
 
-    status_t setAudioStreamType(int type)
+    status_t setAudioStreamType(audio_stream_type_t stream)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IMediaPlayer::getInterfaceDescriptor());
-        data.writeInt32(type);
+        data.writeInt32((int32_t) stream);
         remote()->transact(SET_AUDIO_STREAM_TYPE, data, &reply);
         return reply.readInt32();
     }
@@ -397,7 +397,7 @@
         } break;
         case SET_AUDIO_STREAM_TYPE: {
             CHECK_INTERFACE(IMediaPlayer, data, reply);
-            reply->writeInt32(setAudioStreamType(data.readInt32()));
+            reply->writeInt32(setAudioStreamType((audio_stream_type_t) data.readInt32()));
             return NO_ERROR;
         } break;
         case SET_LOOPING: {