audio: add spatializer output flag

Add output flag AUDIO_OUTPUT_FLAG_SPATIALIZER indicating an
output mix port dedicated to spatial audio.

Bug: 210803914
Test: manual spatial audio tests
Change-Id: Iad181e109a9729ddc2f80940b17cb29d9fb2115a
diff --git a/media/libaudioclient/AidlConversion.cpp b/media/libaudioclient/AidlConversion.cpp
index b7be3ff..b798415 100644
--- a/media/libaudioclient/AidlConversion.cpp
+++ b/media/libaudioclient/AidlConversion.cpp
@@ -1504,6 +1504,8 @@
             return AUDIO_OUTPUT_FLAG_GAPLESS_OFFLOAD;
         case AudioOutputFlags::ULTRASOUND:
             return AUDIO_OUTPUT_FLAG_ULTRASOUND;
+        case AudioOutputFlags::SPATIALIZER:
+            return AUDIO_OUTPUT_FLAG_SPATIALIZER;
     }
     return unexpected(BAD_VALUE);
 }
@@ -1547,6 +1549,8 @@
             return AudioOutputFlags::GAPLESS_OFFLOAD;
         case AUDIO_OUTPUT_FLAG_ULTRASOUND:
             return AudioOutputFlags::ULTRASOUND;
+        case AUDIO_OUTPUT_FLAG_SPATIALIZER:
+            return AudioOutputFlags::SPATIALIZER;
     }
     return unexpected(BAD_VALUE);
 }