dt-bindings: serial: samsung_uart: drop ref from reg-io-width

reg-io-width is a standard property, so no need for defining its type
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220823101000.386927-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/serial/samsung_uart.yaml

@@ -37,7 +37,6 @@ properties:
     description: |
       The size (in bytes) of the IO accesses that should be performed
       on the device.
-    $ref: /schemas/types.yaml#/definitions/uint32
     enum: [ 1, 4 ]
 
   clocks: