dt-bindings: usb: dwc2: add compatible "intel,socfpga-agilex-hsotg"

Add the compatible "intel,socfpga-agilex-hsotg" to the DWC2
implementation, because the Agilex DWC2 implementation does not support
clock gating.
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NDinh Nguyen <dinguyen@kernel.org>

Documentation/devicetree/bindings/usb/dwc2.yaml

@@ -53,6 +53,7 @@ properties:
           - const: st,stm32mp15-hsotg
           - const: snps,dwc2
       - const: samsung,s3c6400-hsotg
+      - const: intel,socfpga-agilex-hsotg
 
   reg:
     maxItems: 1