Integrate meta-seconorth-nogplv3/systemd-networkd-overrides

Commit: seco-ne/yocto/layers/meta-seconorth-nogplv3@a6535682

systemd-networkd: Enable networkd by override the removal variable

As it is difficult/impossible to undo a remove, the item to remove was stored in a variable. This variable is reset here, to undo the remove.