Add EventFlag for effect HAL thread processing

Bug: 261129656
Test: atest --test-mapping hardware/interfaces/audio/aidl/vts:presubmit
Change-Id: Ieb81cef8785ea986bc2fc27fd142fd868e8bd103
diff --git a/media/libaudiohal/impl/EffectHalAidl.h b/media/libaudiohal/impl/EffectHalAidl.h
index 8966363..47049d7 100644
--- a/media/libaudiohal/impl/EffectHalAidl.h
+++ b/media/libaudiohal/impl/EffectHalAidl.h
@@ -23,6 +23,7 @@
 #include <fmq/AidlMessageQueue.h>
 #include <media/audiohal/EffectHalInterface.h>
 #include <system/audio_effect.h>
+#include <system/audio_effects/aidl_effects_utils.h>
 
 #include "EffectConversionHelperAidl.h"