dt-bindings: usb: ci-hdrc-usb2: add fsl,imx8ulp-usb compatible

The imx8ulp and imx8dxl are compatible. This will add fsl,imx8ulp-usb
to the compatible property.
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Message-ID: <20230530104007.1294702-1-xu.yang_2@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/ci-hdrc-usb2.yaml

@@ -45,7 +45,9 @@ properties:
               - fsl,vf610-usb
           - const: fsl,imx27-usb
       - items:
-          - const: fsl,imx8dxl-usb
+          - enum:
+              - fsl,imx8dxl-usb
+              - fsl,imx8ulp-usb
           - const: fsl,imx7ulp-usb
           - const: fsl,imx6ul-usb
       - items: