bonding: use exit_batch_rtnl() method

bonding: use exit_batch_rtnl() method

exit_batch_rtnl() is called while RTNL is held,
and devices to be unregistered can be queued in the dev_kill_list.

This saves one rtnl_lock()/rtnl_unlock() pair,
and one unregister_netdevice_many() call.

v2: Added bond_net_pre_exit() method to make sure bond_destroy_sysfs()
    is called before we unregister the devices in bond_net_exit_batch_rtnl
 (Antoine Tenart : https://lore.kernel.org/netdev/170688415193.5216.10499830272732622816@kwain/)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Jay Vosburgh <j.vosburgh@gmail.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Reviewed-by: Antoine Tenart <atenart@kernel.org>
Link: https://lore.kernel.org/r/20240206144313.2050392-6-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>