Updating gNB tun interface name and adding nsa config file.

openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.c

@@ -385,8 +385,8 @@ uint64_t pdcp_module_init(uint64_t _pdcp_optmask, int id)
       LOG_I(PDCP, "UE pdcp will use tun interface\n");
       start_pdcp_tun_ue();
     } else if(ENB_NAS_USE_TUN) {
-      netlink_init_tun("enb", 1, id);
-      nas_config(1, 1, 1, "enb");
+      netlink_init_tun("gnb", 1, id);
+      nas_config(1, 1, 1, "gnb");
       LOG_I(PDCP, "ENB pdcp will use tun interface\n");
       start_pdcp_tun_enb();
     } else {