Function esp_ble_gatts_app_unregister

pub unsafe extern "C" fn esp_ble_gatts_app_unregister(
    gatts_if: esp_gatt_if_t,
) -> esp_err_t

@brief unregister with GATT Server.

@param[in] gatts_if: GATT server access interface @return - ESP_OK : success - other : failed