dt-bindings: ci-hdrc-usb2: s/gadget-itc-setting/itc-setting in example

What the code expect is "itc-setting" rather than "gadget-itc-setting",
and this is also correctly described in the optional properties.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>

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

@@ -93,7 +93,7 @@ Example:
 		phys = <&usb_phy0>;
 		phy-names = "usb-phy";
 		vbus-supply = <&reg_usb0_vbus>;
-		gadget-itc-setting = <0x4>; /* 4 micro-frames */
+		itc-setting = <0x4>; /* 4 micro-frames */
 		 /* Incremental burst of unspecified length */
 		ahb-burst-config = <0x0>;
 		tx-burst-size-dword = <0x10>; /* 64 bytes */