dt-bindings: mfd: syscon: Drop ref from reg-io-width

reg-io-width is a standard property, so no need for defining its type
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20220823101021.387034-1-krzysztof.kozlowski@linaro.org

Documentation/devicetree/bindings/mfd/syscon.yaml

@@ -81,7 +81,6 @@ 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, 2, 4, 8]
 
   hwlocks: