mem-ruby: Populate missing txnId field to CompI response

Change-Id: I02030f61dd4e64a29b16e47d49bcde8c723260b5
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>

src/mem/ruby/protocol/chi/CHI-cache-actions.sm

@@ -2567,6 +2567,8 @@ action(Send_CompI, desc="") {
     out_msg.type := CHIResponseType:Comp_I;
     out_msg.responder := machineID;
     out_msg.Destination.add(tbe.requestor);
+    out_msg.Destination.add(tbe.requestor);
+    out_msg.txnId := tbe.txnId;
     out_msg.dbid := tbe.txnId;
   }
 }