realtek: dts: convert devices to mdio bus 1-3

realtek: dts: convert devices to mdio bus 1-3

Switch the mdio bus topology for devices that have their phys
attached to bus 1-3. This does not have any impact because
the mdio driver was completly redisgned

With this commit the bus id is stored twice. Once in the (new)
bus and in the (old) realtek,smi-address property. E.g.

&mdio_bus1 {
  reg = <1>; <<< bus id
  phy24: ethernet-phy@24 {
    reg = <26>;
    compatible = "ethernet-phy-ieee802.3-c22";
    realtek,smi-address = <1 2>; <<< bus & address id
  };
};

This redundancy will be removed later.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/21438
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>