net: devlink: move port_type_netdev_checks() call to __devlink_port_type_set()

As __devlink_port_type_set() is going to be called directly from netdevice
notifier event handle in one of the follow-up patches, move the
port_type_netdev_checks() call there.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>