audiopolicy: switch to VolumeGroup for Output

Volume used to be managed per stream type.
VolumeGroup is a configurable way to manage volume affinity.
This CL allows to switch to VolumeGroup as new volume affinity management.

Bug: 124767636
Test: audio smoke tests

Change-Id: I71fc214f6db3158f0f05920cc3d700b29db1a4bc
Signed-off-by: François Gaffie <francois.gaffie@renault.com>
diff --git a/services/audiopolicy/common/include/Volume.h b/services/audiopolicy/common/include/Volume.h
index 48b5271..561f100 100644
--- a/services/audiopolicy/common/include/Volume.h
+++ b/services/audiopolicy/common/include/Volume.h
@@ -16,19 +16,22 @@
 
 #pragma once
 
+#include <media/AudioCommonTypes.h>
 #include <system/audio.h>
 #include <utils/Log.h>
 #include <math.h>
 
 namespace android {
 
+
 /**
  * VolumeSource is the discriminent for volume management on an output.
  * It used to be the stream type by legacy, it may be host volume group or a volume curves if
- * we allow to have more than one curve per volume group.
+ * we allow to have more than one curve per volume group (mandatory to get rid of AudioServer
+ * stream aliases.
  */
-enum VolumeSource : std::underlying_type<audio_stream_type_t>::type;
-static const VolumeSource VOLUME_SOURCE_NONE = static_cast<VolumeSource>(AUDIO_STREAM_DEFAULT);
+enum VolumeSource : std::underlying_type<volume_group_t>::type;
+static const VolumeSource VOLUME_SOURCE_NONE = static_cast<VolumeSource>(VOLUME_GROUP_NONE);
 
 static inline VolumeSource streamToVolumeSource(audio_stream_type_t stream) {
     return static_cast<VolumeSource>(stream);