dt-bindings: iio: potentiometer: 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/20220816124321.67817-9-krzysztof.kozlowski@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/potentiometer/microchip,mcp41010.yaml

@@ -25,14 +25,15 @@ properties:
   reg:
     maxItems: 1
 
-  spi-max-frequency: true
-
-additionalProperties: false
-
 required:
   - compatible
   - reg
 
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
 examples:
   - |
     spi {

Documentation/devicetree/bindings/iio/potentiometer/microchip,mcp4131.yaml

@@ -80,14 +80,15 @@ properties:
   reg:
     maxItems: 1
 
-  spi-max-frequency: true
-
-additionalProperties: false
-
 required:
   - compatible
   - reg
 
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
 examples:
   - |
     spi {