add missing file 3gpp_29.518.h

src/common/3gpp_29.518.h

+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this
+ * file except in compliance with the License. You may obtain a copy of the
+ * License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#ifndef FILE_3GPP_29_518_SMF_SEEN
+#define FILE_3GPP_29_518_SMF_SEEN
+#include "3gpp_29.571.h"
+#include "3gpp_23.003.h"
+
+typedef struct ng_ran_target_id_s{
+	global_ran_node_id_t global_ran_node_id;
+	tai_t tai;
+} ng_ran_target_id_t;
+
+#endif