arm64: dts: qcom: sc7180: Add maximum speed property for DWC3 USB node

Adding maximum speed property for DWC3 USB node which can be used
for setting interconnect bandwidth.
Signed-off-by: NSandeep Maheswaram <sanm@codeaurora.org>
Reviewed-by: NMatthias Kaehlcke <mka@chromium.org>
Link: https://lore.kernel.org/r/1595317489-18432-3-git-send-email-sanm@codeaurora.orgSigned-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/sc7180.dtsi

@@ -2656,6 +2656,7 @@
 				snps,dis_enblslpm_quirk;
 				phys = <&usb_1_hsphy>, <&usb_1_ssphy>;
 				phy-names = "usb2-phy", "usb3-phy";
+				maximum-speed = "super-speed";
 			};
 		};