arm64: dts: qcom: ipq6018: Add mdio bus description

The IPQ60xx has the same MDIO bug block as IPQ4019. Add IO range and
clock resources description.
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Baruch Siach <baruch.siach@siklu.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/ef01a79ccc6ef86dc3a10d0fa3331794d49e9859.1646031524.git.baruch@tkos.co.il

arch/arm64/boot/dts/qcom/ipq6018.dtsi

@@ -630,6 +630,16 @@ qrtr_requests {
 			};
 		};
 
+		mdio: mdio@90000 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "qcom,ipq6018-mdio", "qcom,ipq4019-mdio";
+			reg = <0x0 0x90000 0x0 0x64>;
+			clocks = <&gcc GCC_MDIO_AHB_CLK>;
+			clock-names = "gcc_mdio_ahb_clk";
+			status = "disabled";
+		};
+
 		qusb_phy_1: qusb@59000 {
 			compatible = "qcom,ipq6018-qusb2-phy";
 			reg = <0x0 0x059000 0x0 0x180>;