dt-bindings: iio: dac: ad5791: ldac gpio is active low

On the example, the ldac gpio is flagged as active high, when in reality
its an active low gpio. Fix the example by using the active low flag for
the ldac gpio.

Fixes: baaa92d ("dt-bindings: iio: dac: ad5791: Add optional reset, clr and ldac gpios")
Signed-off-by: Axel Haslam <[email protected]>
Acked-by: Conor Dooley <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

Author: ahaslam2

Documentation/devicetree/bindings/iio/dac/adi,ad5791.yaml

@@ -91,7 +91,7 @@ examples:
             vrefn-supply = <&dac_vrefn>;
             reset-gpios = <&gpio_bd 16 GPIO_ACTIVE_LOW>;
             clear-gpios = <&gpio_bd 17 GPIO_ACTIVE_LOW>;
-            ldac-gpios = <&gpio_bd 18 GPIO_ACTIVE_HIGH>;
+            ldac-gpios = <&gpio_bd 18 GPIO_ACTIVE_LOW>;
         };
     };
 ...