Use frozen copy of ion.h for this code. am: 35ffe308d2 am: 8357b3ccb7
am: decfd6003f

Change-Id: I91862a0b19020ad0689aeb679db850d2a6127d45
diff --git a/src/Android.mk b/src/Android.mk
index 6c9827c..628bd19 100644
--- a/src/Android.mk
+++ b/src/Android.mk
@@ -55,6 +55,10 @@
     $(TARGET_OUT_HEADERS)/pvr \
     $(LOCAL_PATH)/hwdefs
 
+# Use the frozen version of ion.h.
+LOCAL_C_INCLUDES += \
+    $(TOP)/system/core/libion/kernel-headers \
+
 LOCAL_SHARED_LIBRARIES += libdl libdrm libwsbm libcutils \
     libutils libbinder libhardware liblog libsync libnativewindow