spi: dt-bindings: Fix unevaluatedProperties warnings in examples

The 'unevaluatedProperties' schema checks is not fully working and doesn't
catch some cases where there's a $ref to another schema. A fix is pending,
but results in new warnings in examples.

'spi-max-frequency' is supposed to be a per SPI peripheral device property,
not a SPI controller property, so drop it.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20220526014141.2872567-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: robherring

Documentation/devicetree/bindings/spi/microchip,mpfs-spi.yaml

@@ -47,6 +47,5 @@ examples:
         clocks = <&clkcfg CLK_SPI0>;
         interrupt-parent = <&plic>;
         interrupts = <54>;
-        spi-max-frequency = <25000000>;
     };
 ...

Documentation/devicetree/bindings/spi/qcom,spi-geni-qcom.yaml

@@ -110,7 +110,6 @@ examples:
         pinctrl-names = "default";
         pinctrl-0 = <&qup_spi1_default>;
         interrupts = <GIC_SPI 602 IRQ_TYPE_LEVEL_HIGH>;
-        spi-max-frequency = <50000000>;
         #address-cells = <1>;
         #size-cells = <0>;
     };