AudioPolicy: setVolumeIndexForAttributes tightening

Make AudioSystem method setVolumeIndexForAttributes only work
from system components.

Bug: 171965882
Test: see poc
Change-Id: I5c893365e2cdaed20434b11d5f9ded3a42afba63
diff --git a/media/libaudioclient/IAudioPolicyService.cpp b/media/libaudioclient/IAudioPolicyService.cpp
index 81f9dff..cd098b5 100644
--- a/media/libaudioclient/IAudioPolicyService.cpp
+++ b/media/libaudioclient/IAudioPolicyService.cpp
@@ -1614,6 +1614,7 @@
 //      case SET_FORCE_USE:
         case INIT_STREAM_VOLUME:
         case SET_STREAM_VOLUME:
+        case SET_VOLUME_ATTRIBUTES:
         case REGISTER_POLICY_MIXES:
         case SET_MASTER_MONO:
         case GET_SURROUND_FORMATS: