The "ports" node was renamed. Update driver to match device-tree.
Cc: Markus Stockhausen <markus.stockhausen@gmx.de>
Fixes: 63729a8d6e ("realtek: dts: replace ports by ethernet-ports")
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Link: https://github.com/openwrt/openwrt/pull/22242
Signed-off-by: Robert Marko <robimarko@gmail.com>