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/media/libmedia/Android.mk b/media/libmedia/Android.mk
index 121e38a..f7c54fa 100644
--- a/media/libmedia/Android.mk
+++ b/media/libmedia/Android.mk
@@ -68,6 +68,7 @@
     $(call include-path-for, graphics corecg) \
     $(TOP)/frameworks/base/include/media/stagefright/openmax \
     external/icu4c/common \
-    external/expat/lib
+    external/expat/lib \
+    system/media/audio_effects/include
 
 include $(BUILD_SHARED_LIBRARY)