The submenu of two diag modules is missing, fix it.
Fixes: 65de1e0 ("kernel: add missing symbols for lxc")
Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Link: https://github.com/openwrt/openwrt/pull/18480
Signed-off-by: Robert Marko <robimarko@gmail.com>