dt-bindings: iio: adc: ad4130: use spi-peripheral-props.yaml

Reference the "spi-peripheral-props.yaml" schema to allow using
all SPI device properties.

Signed-off-by: Cosmin Tanislav <cosmin.tanislav@analog.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221115151955.394030-1-cosmin.tanislav@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/adc/adi,ad4130.yaml

@@ -190,7 +190,10 @@ patternProperties:
       - reg
       - diff-channels
 
-additionalProperties: false
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
 
 examples:
   - |