arm64: dts: qcom: ipq8074: add SoC specific compatible to MDIO

Add the newly documented SoC compatible to MDIO in order to be able to
validate clocks for it.
Signed-off-by: Robert Marko <robimarko@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221114194734.3287854-5-robimarko@gmail.com

arch/arm64/boot/dts/qcom/ipq8074.dtsi

@@ -254,7 +254,7 @@ pcie_phy1: phy@8e200 {
 		};
 
 		mdio: mdio@90000 {
-			compatible = "qcom,ipq4019-mdio";
+			compatible = "qcom,ipq8074-mdio", "qcom,ipq4019-mdio";
 			reg = <0x00090000 0x64>;
 			#address-cells = <1>;
 			#size-cells = <0>;