net: fs_enet: allow nvmem to override MAC address

NVMEM typically loads after the ethernet driver and
of_get_ethdev_address returns -EPROBE_DEFER. return in such a case to
allow NVMEM to work.

Signed-off-by: Rosen Penev <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c

···
 	spin_lock_init(&fep->lock);
 	spin_lock_init(&fep->tx_lock);
 
-	of_get_ethdev_address(ofdev->dev.of_node, ndev);
+	ret = of_get_ethdev_address(ofdev->dev.of_node, ndev);
+	if (ret == -EPROBE_DEFER)
+		goto out_cleanup_data;
 
 	ret = fep->ops->allocate_bd(ndev);
 	if (ret)