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

Change-Id: I0830d652878b79d352fc6a5cdcf695ff8089a37b
diff --git a/src/Android.mk b/src/Android.mk
index 8ec21ab..56f7b15 100644
--- a/src/Android.mk
+++ b/src/Android.mk
@@ -53,6 +53,10 @@
     $(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