dt-bindings: mfd: wlf,arizona: Add spi-max-frequency

The Wolfson Microelectronics Arizona audio can be connected via SPI bus
(e.g. WM5110 on Exynos5433 TM2 board), so allow SPI peripheral
properties.

Reported-by: Rob Herring <[email protected]>
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Rob Herring <[email protected]>
Acked-by: Charles Keepax <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: krzk

Documentation/devicetree/bindings/mfd/wlf,arizona.yaml

@@ -14,6 +14,7 @@ description: |
   range of analogue I/O.
 
 allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml
   - $ref: /schemas/sound/wlf,arizona.yaml#
   - $ref: /schemas/regulator/wlf,arizona.yaml#
   - $ref: /schemas/extcon/wlf,arizona.yaml#