dt-bindings: iio: Drop unused header includes in examples

Drop includes of headers which example code does not use.  No functional
impact.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: David Heidelberg <david@ixit.cz>
Acked-by: Matti Vaittinen <mazziesaccount@gmail.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20250724111345.47889-5-krzysztof.kozlowski@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/accel/bosch,bma255.yaml

@@ -107,7 +107,6 @@ examples:
         };
     };
   - |
-    # include <dt-bindings/interrupt-controller/irq.h>
     spi {
         #address-cells = <1>;
         #size-cells = <0>;