networks: Enable assignment of network interfaces on Turris 1.x
Custom assignment of network interfaces on Turris 1.x devices was disabled until turrishw support for Turris 1.x will implemented.
Unfortunately, even though turrishw supports Turris 1.x devices for quite some time, update of network interface assignment is still disabled in foris-controller for Turris 1.x.
Ideally all it needs to be done, is to remove this if branch: https://gitlab.nic.cz/turris/foris-controller/foris-controller/-/blob/master/foris_controller_backends/networks/__init__.py#L311-312
cc: @srechner, @agumroian