realtek: dsa: fix ports => ethernet-ports renaming

The "ports" node was renamed.  Update driver to match device-tree.

Cc: Markus Stockhausen <markus.stockhausen@gmx.de>
Fixes: 63729a8 ("realtek: dts: replace ports by ethernet-ports")
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Link: openwrt#22242
Signed-off-by: Robert Marko <robimarko@gmail.com>

Author: bmork

target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/common.c

@@ -1332,7 +1332,7 @@ static int rtldsa_ethernet_loaded(struct platform_device *pdev)
 	struct device_node *ports, *port;
 	int ret = -EPROBE_DEFER;
 
-	ports = of_get_child_by_name(dn, "ports");
+	ports = of_get_child_by_name(dn, "ethernet-ports");
 	if (!ports)
 		return -ENODEV;