net: introduce a helper to move notifier block to different namespace

Currently, net_dev() netdev notifier variant follows the netdev with
per-net notifier from namespace to namespace. This is implemented
by move_netdevice_notifiers_dev_net() helper.

For devlink it is needed to re-register per-net notifier during
devlink reload. Introduce a new helper called
move_netdevice_notifier_net() and share the unregister/register code
with existing move_netdevice_notifiers_dev_net() helper.

Signed-off-by: Jiri Pirko <[email protected]>
Reviewed-by: Ido Schimmel <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>

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