dt-binding: cdns,usb3: Fix cdns,on-chip-buff-size type

In cdns3-gadget.c, 'cdns,on-chip-buff-size' was read using
device_property_read_u16(). It resulted in 0 if a 32bit value was used
in dts. This commit fixes the dt binding doc to declare it as u16.

Cc: [email protected]
Fixes: 68989fe ("dt-bindings: usb: Convert cdns-usb3.txt to YAML schema")
Signed-off-by: Frank Li <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>

Author: nxpfrankli

Documentation/devicetree/bindings/usb/cdns,usb3.yaml

@@ -64,7 +64,7 @@ properties:
     description:
       size of memory intended as internal memory for endpoints
       buffers expressed in KB
-    $ref: /schemas/types.yaml#/definitions/uint32
+    $ref: /schemas/types.yaml#/definitions/uint16
 
   cdns,phyrst-a-enable:
     description: Enable resetting of PHY if Rx fail is detected