extcon: arizona: Update binding example to use available defines

Signed-off-by: Charles Keepax <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

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

···
 		1 2 1 /* MICDET2 MICBIAS2 GPIO=high */
 	>;
 
-	wlf,gpsw = <0>;
+	wlf,gpsw = <ARIZONA_GPSW_OPEN>;
 };