Revert "Audio V4: Split system and vendor Audio.h"

This reverts commit c246f5eaa1dabda72eb3bcf3823d4cab65bd4e83.

Reason for revert: Breaks the build of multiple devices

Change-Id: I516d7467369f9a9b9872e7378c8b2eabc8b1d96e
diff --git a/visualizer/Android.mk b/visualizer/Android.mk
index 4773bf8..7d7cfe9 100644
--- a/visualizer/Android.mk
+++ b/visualizer/Android.mk
@@ -40,9 +40,7 @@
     -Werror \
     -Wno-unused-variable \
 
-LOCAL_HEADER_LIBRARIES := \
-    libhardware_headers \
-    android.hardware.audio.effect.legacy@2.0
+LOCAL_HEADER_LIBRARIES := libhardware_headers
 
 LOCAL_MODULE_RELATIVE_PATH := soundfx
 LOCAL_MODULE:= libqcomvisualizer
@@ -51,6 +49,7 @@
 
 LOCAL_C_INCLUDES := \
 	external/tinyalsa/include \
+	$(call include-path-for, audio-effects)
 
 LOCAL_HEADER_LIBRARIES += libsystem_headers
 include $(BUILD_SHARED_LIBRARY)