ARM: dts: witherspoon: Cleanup gpio-keys-polled properties

dtbs_check gave the following warning:

    Warning (avoid_unnecessary_addr_size): /gpio-keys-polled: unnecessary #address-cells/#size-cells without "ranges" or child "reg" property

Cc: Joel Stanley <joel@jms.id.au>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts

@@ -77,8 +77,6 @@ iio-hwmon-battery {
 
 	gpio-keys-polled {
 		compatible = "gpio-keys-polled";
-		#address-cells = <1>;
-		#size-cells = <0>;
 		poll-interval = <1000>;
 
 		fan0-presence {