Moved and renamed effect API header files

Moved specific effect header files to
system/media/audio_effects/include/audio_effects
and renamed to lower case (effect_xxx.h).

Change-Id: Icfc2264bfd013cab0395d7e310ada636b9fe3621
diff --git a/include/media/Visualizer.h b/include/media/Visualizer.h
index b8746c2..5d2c874 100644
--- a/include/media/Visualizer.h
+++ b/include/media/Visualizer.h
@@ -18,7 +18,7 @@
 #define ANDROID_MEDIA_VISUALIZER_H
 
 #include <media/AudioEffect.h>
-#include <media/EffectVisualizerApi.h>
+#include <audio_effects/effect_visualizer.h>
 #include <string.h>
 
 /**