fddi: defxx,defza: use dev_addr_set()

fddi: defxx,defza: use dev_addr_set()

Commit 406f42fa0d3c ("net-next: When a bond have a massive amount
of VLANs...") introduced a rbtree for faster Ethernet address look
up. To maintain netdev->dev_addr in this tree we need to make all
the writes to it got through appropriate helpers.

Acked-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>