bridge: netlink: call br_changelink() during br_dev_newlink()

Any bridge options specified during link creation (e.g. ip link add)
are ignored as br_dev_newlink() does not process them.
Use br_changelink() to do it.

Fixes: 13323516 ("bridge: implement rtnl_link_ops->changelink")
Signed-off-by: Ivan Vecera <cera@cera.cz>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>