dt-bindings: iio: adc: Allow interrupts property for AST2600

The device has interrupts allocated according to the datasheet, and
the devicetree already defines the interrupt property. Address existing
warnings by allowing the property.

Signed-off-by: Andrew Jeffery <[email protected]>
Acked-by: Rob Herring (Arm) <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>

Author: amboar

Documentation/devicetree/bindings/iio/adc/aspeed,ast2600-adc.yaml

@@ -44,6 +44,9 @@ properties:
       Input clock used to derive the sample clock. Expected to be the
       SoC's APB clock.
 
+  interrupts:
+    maxItems: 1
+
   resets:
     maxItems: 1