dt-bindings: iio: addac: adi,ad74413r: use spi-peripheral-props.yaml

Reference the spi-peripheral-props.yaml schema to allow using all
properties typical for SPI-connected devices, even these which device
bindings author did not tried yet.

While changing additionalProperties->unevaluatedProperties, put it in
typical place, just before example DTS.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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