dt-bindings: mtd: microchip,mchp48l640: 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 <[email protected]>
Reviewed-by: Tudor Ambarus <[email protected]>
Reviewed-by: Heiko Schocher <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: krzk

Documentation/devicetree/bindings/mtd/microchip,mchp48l640.yaml

@@ -22,13 +22,14 @@ properties:
   reg:
     maxItems: 1
 
-  spi-max-frequency: true
-
 required:
   - compatible
   - reg
 
-additionalProperties: false
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
 
 examples:
   - |