arm64: zynqmp: Add maximum-speed property for dwc3 nodes

dwc3 can be used only for higher speeds than super-speed that's why
explicitly set it up.
This is also aligned with other ZynqMP dts files.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/dts/zynqmp-zc1751-xm015-dc1.dts

@@ -433,6 +433,7 @@
 	snps,usb3_lpm_capable;
 	phy-names = "usb3-phy";
 	phys = <&psgtr 2 PHY_TYPE_USB3 0 2>;
+	maximum-speed = "super-speed";
 };
 
 &zynqmp_dpdma {

arch/arm/dts/zynqmp-zcu106-revA.dts

@@ -1040,6 +1040,7 @@
 	snps,usb3_lpm_capable;
 	phy-names = "usb3-phy";
 	phys = <&psgtr 2 PHY_TYPE_USB3 0 2>;
+	maximum-speed = "super-speed";
 };
 
 &watchdog0 {

arch/arm/dts/zynqmp-zcu111-revA.dts

@@ -861,6 +861,7 @@
 	snps,usb3_lpm_capable;
 	phy-names = "usb3-phy";
 	phys = <&psgtr 2 PHY_TYPE_USB3 0 2>;
+	maximum-speed = "super-speed";
 };
 
 &zynqmp_dpdma {

arch/arm/dts/zynqmp-zcu208-revA.dts

@@ -701,4 +701,5 @@
 	snps,usb3_lpm_capable;
 	phy-names = "usb3-phy";
 	phys = <&psgtr 2 PHY_TYPE_USB3 0 2>;
+	maximum-speed = "super-speed";
 };

arch/arm/dts/zynqmp-zcu216-revA.dts

@@ -705,4 +705,5 @@
 	snps,usb3_lpm_capable;
 	phy-names = "usb3-phy";
 	phys = <&psgtr 2 PHY_TYPE_USB3 0 2>;
+	maximum-speed = "super-speed";
 };