dt-bindings: iio: humidity: hdc3020: add reset-gpios

The HDC3020 provides an active low reset signal that is still not
described in the bindings.

Add reset-gpios to the bindings and the example.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20240303-hdc3020-pm-v3-2-48bc02b5241b@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/humidity/ti,hdc3020.yaml

@@ -34,6 +34,9 @@ properties:
   reg:
     maxItems: 1
 
+  reset-gpios:
+    maxItems: 1
+
 required:
   - compatible
   - reg
@@ -43,6 +46,7 @@ additionalProperties: false
 
 examples:
   - |
+    #include <dt-bindings/gpio/gpio.h>
     #include <dt-bindings/interrupt-controller/irq.h>
     i2c {
         #address-cells = <1>;
@@ -54,5 +58,6 @@ examples:
             vdd-supply = <&vcc_3v3>;
             interrupt-parent = <&gpio3>;
             interrupts = <23 IRQ_TYPE_EDGE_RISING>;
+            reset-gpios = <&gpio3 27 GPIO_ACTIVE_LOW>;
         };
     };