Fix AudioPolicyManagerTestMsd

According to http://ag/28986784, to retrieve output device, the audio
source should remain AUDIO_SOURCE_INVALID.

Change-Id: I6b74767cd25049e4e0f0a5040d904d8de00bd692
Bug: http://b/378534834
Test: AudioPolicyManagerTestMsd
Flag: EXEMPT fix test
diff --git a/services/audiopolicy/tests/audiopolicymanager_tests.cpp b/services/audiopolicy/tests/audiopolicymanager_tests.cpp
index c37540c..f8f91fc 100644
--- a/services/audiopolicy/tests/audiopolicymanager_tests.cpp
+++ b/services/audiopolicy/tests/audiopolicymanager_tests.cpp
@@ -753,7 +753,7 @@
 TEST_P(AudioPolicyManagerTestMsd, GetDirectProfilesForAttributesWithMsd) {
     const audio_attributes_t attr = {
         AUDIO_CONTENT_TYPE_UNKNOWN, AUDIO_USAGE_UNKNOWN,
-        AUDIO_SOURCE_DEFAULT, AUDIO_FLAG_NONE, ""};
+        AUDIO_SOURCE_INVALID, AUDIO_FLAG_NONE, ""};
 
     // count expected direct profiles for the default device
     int countDirectProfilesPrimary = 0;