dt-bindings: iio: dac: use spi-peripheral-props.yaml

Instead of listing directly properties typical for SPI peripherals,
reference the spi-peripheral-props.yaml schema. This allows using all
properties typical for SPI-connected devices, even these which device
bindings author did not tried yet.

Remove the spi-* properties which now come via spi-peripheral-props.yaml
schema, except for the cases when device schema adds some constraints
like maximum frequency.

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

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220816124321.67817-5-krzysztof.kozlowski@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

dt-bindings:iio:dac:ti,dac082s085 yaml conversion

Fairly simple conversion with the exception of the XOR between
spi-cpha and spi-cpol.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Lukas Wunner <lukas@wunner.de>
Link: https://lore.kernel.org/r/20201031134110.724233-17-jic23@kernel.org
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210401140956.224084-3-jic23@kernel.org