Include the framework copy of the OpenMAX headers instead of referencing external/opencore.

Change-Id: I762f59acf5e1f770e4d7c2d89af362bfffebefa6
related-to-bug: 3101573
diff --git a/media/libmedia/Android.mk b/media/libmedia/Android.mk
index b4d01f5..2e5cbe3 100644
--- a/media/libmedia/Android.mk
+++ b/media/libmedia/Android.mk
@@ -50,7 +50,7 @@
 LOCAL_C_INCLUDES := \
     $(JNI_H_INCLUDE) \
     $(call include-path-for, graphics corecg) \
-    $(TOP)/external/opencore/extern_libs_v2/khronos/openmax/include \
+    $(TOP)/frameworks/base/include/media/stagefright/openmax \
     external/icu4c/common \
     external/expat/lib