ionic: change order of devlink port register and netdev register

Make sure that devlink port is registered first and register netdev
after. Unregister netdev before devlnk port unregister.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>