dt-bindings: usb: usb-device: Replace free-form 'reg' with constraints

Replace free-form text of 'reg' property with proper constraints so
incorrect values can be actually reported.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250214114235.49476-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: krzk

Documentation/devicetree/bindings/usb/usb-device.yaml

@@ -39,8 +39,10 @@ properties:
 
   reg:
     description: the number of the USB hub port or the USB host-controller
-      port to which this device is attached. The range is 1-255.
-    maxItems: 1
+      port to which this device is attached.
+    items:
+      - minimum: 1
+        maximum: 255
 
   "#address-cells":
     description: should be 1 for hub nodes with device nodes,