Add reverse tunnel learning attribute.

dash-pipeline/bmv2/dash_pipeline.p4

@@ -81,6 +81,7 @@ control dash_ingress(
                          bit<64> max_resimulated_flow_per_second,
                          @SaiVal[type="sai_object_id_t"] bit<16> outbound_routing_group_id,
                          @SaiVal[type="sai_ip_address_t"] IPv4Address reverse_tunnel_sip,
+                         bit<1> enable_reverse_tunnel_learning,
                          bit<1> is_ha_flow_owner)
     {
         meta.eni_data.cps                                                   = cps;