eth_type moved outside ethernet header in fabric.p4

Change-Id: I3ae0813c5e8aba48767d5bb235fbbcfb75954010
(cherry picked from commit 693d76f189c59579837b559975c0ba767335dfc0)
diff --git a/pipelines/fabric/impl/src/main/resources/include/define.p4 b/pipelines/fabric/impl/src/main/resources/include/define.p4
index 8058416..92aa182 100644
--- a/pipelines/fabric/impl/src/main/resources/include/define.p4
+++ b/pipelines/fabric/impl/src/main/resources/include/define.p4
@@ -23,6 +23,10 @@
 #define WITH_INT
 #endif
 
+#if defined(WITH_BNG)
+#define WITH_DOUBLE_VLAN_TERMINATION
+#endif
+
 #ifndef WITHOUT_XCONNECT
 #define WITH_XCONNECT
 #endif