Made GTP UPD checksum update optinal in SPGW

Change-Id: Icb38c47aeff533bd108a96b77e1b7c1ec866bc0a
diff --git a/pipelines/fabric/src/main/resources/fabric.p4 b/pipelines/fabric/src/main/resources/fabric.p4
index 56ab6e9..8205196 100644
--- a/pipelines/fabric/src/main/resources/fabric.p4
+++ b/pipelines/fabric/src/main/resources/fabric.p4
@@ -66,7 +66,7 @@
     apply {
         pkt_io_egress.apply(hdr, fabric_metadata, standard_metadata);
 #ifdef WITH_SPGW
-        spgw_egress.apply(hdr.gtpu_ipv4, hdr.gtpu_udp, hdr.gtpu,
+        spgw_egress.apply(hdr.ipv4, hdr.gtpu_ipv4, hdr.gtpu_udp, hdr.gtpu,
                           fabric_metadata.spgw, standard_metadata);
 #endif // WITH_SPGW
     }