extcon: arizona: Update binding example to use available defines

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

Documentation/devicetree/bindings/extcon/extcon-arizona.txt

@@ -72,5 +72,5 @@ codec: wm8280@0 {
 		1 2 1 /* MICDET2 MICBIAS2 GPIO=high */
 	>;
 
-	wlf,gpsw = <0>;
+	wlf,gpsw = <ARIZONA_GPSW_OPEN>;
 };