dt-bindings: iio: dac: ad3552r: fix maximum spi speed

Fix maximum SPI clock speed, as per datasheet (Rev. B, page 6).

Fixes: b0a96c5 ("dt-bindings: iio: dac: Add adi,ad3552r.yaml")
Cc: [email protected]
Signed-off-by: Angelo Dureghello <[email protected]>
Acked-by: Krzysztof Kozlowski <[email protected]>
Link: https://patch.msgid.link/20241003-wip-bl-ad3552r-axi-v0-iio-testing-v4-4-ceb157487329@baylibre.com
Signed-off-by: Jonathan Cameron <[email protected]>

Author: spectrum70

Documentation/devicetree/bindings/iio/dac/adi,ad3552r.yaml

@@ -30,7 +30,7 @@ properties:
     maxItems: 1
 
   spi-max-frequency:
-    maximum: 30000000
+    maximum: 66000000
 
   reset-gpios:
     maxItems: 1