cu_cp,test: fix uninitialized variable in test messages

Author: andrepuschmann

tests/unittests/cu_cp/test_helpers.h

@@ -120,6 +120,8 @@ struct dummy_du_processor_e1ap_control_notifier : public du_processor_e1ap_contr
 
       // add one UP transport item
       e1ap_up_params_item up_item;
+      up_item.cell_group_id = 0;
+      up_item.up_tnl_info   = {transport_layer_address{"127.0.0.1"}, int_to_gtp_teid(0x1)};
       drb_item.ul_up_transport_params.push_back(up_item);
       res_setup_item.drb_setup_list_ng_ran.emplace(drb_id, drb_item);