[ONOS-7238] fix ICMP checksum error of fabric.p4

Change-Id: I921504ccdb295488bbea8636f412137bbab0d8f5
diff --git a/pipelines/fabric/src/main/resources/include/header.p4 b/pipelines/fabric/src/main/resources/include/header.p4
index b243c94..c36f5a0 100644
--- a/pipelines/fabric/src/main/resources/include/header.p4
+++ b/pipelines/fabric/src/main/resources/include/header.p4
@@ -108,6 +108,9 @@
     bit<8> icmp_type;
     bit<8> icmp_code;
     bit<16> checksum;
+    bit<16> identifier;
+    bit<16> sequence_number;
+    bit<64> timestamp;
 }
 
 //Custom metadata definition