net: ethernet: ti: am65-cpsw: set correct devlink flavour for unused ports

am65_cpsw_nuss_register_ndevs() skips calling devlink_port_type_eth_set()
for ports without assigned netdev, triggering the following warning when
DEVLINK_PORT_TYPE_WARN_TIMEOUT elapses after 3600s:

    Type was not set for devlink port.
    WARNING: CPU: 0 PID: 129 at net/core/devlink.c:8095 devlink_port_type_warn+0x18/0x30

Fixes: 0680e20a ("net: ethernet: ti: am65-cpsw: Fix devlink port register sequence")
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/am65-cpsw-nuss.c

@@ -2476,7 +2476,10 @@ static int am65_cpsw_nuss_register_devlink(struct am65_cpsw_common *common)
 		port = am65_common_get_port(common, i);
 		dl_port = &port->devlink_port;
 
-		attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
+		if (port->ndev)
+			attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
+		else
+			attrs.flavour = DEVLINK_PORT_FLAVOUR_UNUSED;
 		attrs.phys.port_number = port->port_id;
 		attrs.switch_id.id_len = sizeof(resource_size_t);
 		memcpy(attrs.switch_id.id, common->switch_id, attrs.switch_id.id_len);