interfaces: T3871: name interfaces from a slot-anchored mapping store

Names used to be derived from 'hw-id' in config.boot. A node carrying an
address but no hw-id had to be matched to some NIC, and nothing available at
boot could say which one - every heuristic could bind a configured address to
the wrong physical wire.

Naming authority moves to a mapping store binding a name to the slot the
hardware occupies. The slot is the identity, so a replacement card in that
slot is that interface again. The store renders systemd .link files, leaving
udev to apply names as devices appear.

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