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/IAudioPolicyService.h b/include/media/IAudioPolicyService.h
index 9807cbe..1ac0bbf 100644
--- a/include/media/IAudioPolicyService.h
+++ b/include/media/IAudioPolicyService.h
@@ -85,7 +85,7 @@
                                     int id) = 0;
     virtual status_t unregisterEffect(int id) = 0;
     virtual status_t setEffectEnabled(int id, bool enabled) = 0;
-    virtual bool     isStreamActive(int stream, uint32_t inPastMs = 0) const = 0;
+    virtual bool     isStreamActive(audio_stream_type_t stream, uint32_t inPastMs = 0) const = 0;
     virtual status_t queryDefaultPreProcessing(int audioSession,
                                               effect_descriptor_t *descriptors,
                                               uint32_t *count) = 0;