ipq40xx: extend DT mdio node to be more accessible

The MDIO node will become more important in the future.
Hence, this patch adds DT labels to make the properties
inside the various subnodes more accessible.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/ipq40xx/patches-4.19/701-dts-ipq4019-add-mdio-node.patch

@@ -19,30 +19,30 @@ so the info might change.
  			status = "disabled";
  		};
  
-+		mdio@90000 {
++		mdio: mdio@90000 {
 +			#address-cells = <1>;
 +			#size-cells = <0>;
 +			compatible = "qcom,ipq4019-mdio";
 +			reg = <0x90000 0x64>;
 +			status = "disabled";
 +
-+			ethernet-phy@0 {
++			ethphy0: ethernet-phy@0 {
 +				reg = <0>;
 +			};
 +
-+			ethernet-phy@1 {
++			ethphy1: ethernet-phy@1 {
 +				reg = <1>;
 +			};
 +
-+			ethernet-phy@2 {
++			ethphy2: ethernet-phy@2 {
 +				reg = <2>;
 +			};
 +
-+			ethernet-phy@3 {
++			ethphy3: ethernet-phy@3 {
 +				reg = <3>;
 +			};
 +
-+			ethernet-phy@4 {
++			ethphy4: ethernet-phy@4 {
 +				reg = <4>;
 +			};
 +		};