dt-bindings: phy: qcom,qusb2: Document IPQ5210 compatible

Document the QUSB2 PHY compatible for the IPQ5210 SoC. The IPQ5210 PHY is
compatible with the IPQ6018 QUSB2 PHY, so allow it to use
qcom,ipq6018-qusb2-phy as the fallback compatible.

Signed-off-by: Varadarajan Narayanan <varadarajan.narayanan@oss.qualcomm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260608103344.2740174-2-varadarajan.narayanan@oss.qualcomm.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/qcom,qusb2-phy.yaml

@@ -30,6 +30,10 @@ properties:
               - qcom,sdm660-qusb2-phy
               - qcom,sm4250-qusb2-phy
               - qcom,sm6115-qusb2-phy
+      - items:
+          - enum:
+              - qcom,ipq5210-qusb2-phy
+          - const: qcom,ipq6018-qusb2-phy
       - items:
           - enum:
               - qcom,sc7180-qusb2-phy