dt-bindings: PCI: qcom: Document the IPQ5424 PCIe controller

Document the PCIe controller on the IPQ5424 platform using the
IPQ9574 bindings as a fallback, since the PCIe on the IPQ5424
is similar to IPQ9574.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Manikanta Mylavarapu <[email protected]>
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Manivannan Sadhasivam <[email protected]>

Author: Manikanta Mylavarapu

Documentation/devicetree/bindings/pci/qcom,pcie.yaml

@@ -31,6 +31,10 @@ properties:
           - qcom,pcie-qcs404
           - qcom,pcie-sdm845
           - qcom,pcie-sdx55
+      - items:
+          - enum:
+              - qcom,pcie-ipq5424
+          - const: qcom,pcie-ipq9574
       - items:
           - const: qcom,pcie-msm8998
           - const: qcom,pcie-msm8996