fix issue that rru cannot release ue if doing attach/detach in nfapi mode

nfapi/open-nFAPI/vnf/public_inc/nfapi_vnf_interface.h

@@ -988,6 +988,15 @@ int nfapi_vnf_p7_lbt_dl_config_req(nfapi_vnf_p7_config_t* config, nfapi_lbt_dl_c
  */
 int nfapi_vnf_p7_vendor_extension(nfapi_vnf_p7_config_t* config, nfapi_p7_message_header_t* msg);
 
+/*! Send the RELEASE_RNTI.request
+ *  \param config A pointer to the vnf p7 configuration
+ *  \param req A data structure for the decoded RELEASE_RNTI.request.
+ *  \return A status value. 0 equal success, -1 indicates failure
+ *
+ *  The caller is responsiable for memory management of any pointers set in the req, which
+ *  may be released after this function call has returned or at a later pointer
+ */
+int nfapi_vnf_p7_ue_release_req(nfapi_vnf_p7_config_t* config, nfapi_ue_release_request_t* req);
 #if defined(__cplusplus)
 }
 #endif