dt-bindings: phy: qcom,qmp: Add IPQ6018 USB3 PHY

Add compatible string for USB3 PHY in Qualcomm IPQ6018 SoC.
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Link: https://lore.kernel.org/r/3d86f45004fe2fcbae0a2cd197df81a1fd076a1e.1628085910.git.baruch@tkos.co.ilSigned-off-by: Vinod Koul <vkoul@kernel.org>

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

@@ -18,6 +18,7 @@ properties:
   compatible:
     enum:
       - qcom,ipq6018-qmp-pcie-phy
+      - qcom,ipq6018-qmp-usb3-phy
       - qcom,ipq8074-qmp-pcie-phy
       - qcom,ipq8074-qmp-usb3-phy
       - qcom,msm8996-qmp-pcie-phy