libaudiohal: Fix broken "legacy audio HAL" build

Restore accidenally removed #include directive

Bug: 33241851
Test: build with USE_LEGACY_LOCAL_AUDIO_HAL=true
Change-Id: I191233f533cea11eb95bc72eb06a9ce12dcc19d0
diff --git a/media/libaudiohal/EffectHalLocal.cpp b/media/libaudiohal/EffectHalLocal.cpp
index 6175b6b..dd465c3 100644
--- a/media/libaudiohal/EffectHalLocal.cpp
+++ b/media/libaudiohal/EffectHalLocal.cpp
@@ -17,6 +17,7 @@
 #define LOG_TAG "EffectHalLocal"
 //#define LOG_NDEBUG 0
 
+#include <media/EffectsFactoryApi.h>
 #include <utils/Log.h>
 
 #include "EffectHalLocal.h"