ar71xx: wndr4300: use KEY_RFKILL code for the Wireless button

Based on the the WNDR3700v4 support patch from Ralph Perlich:
  http://patchwork.openwrt.org/patch/4763/

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 40477

target/linux/ar71xx/files/arch/mips/ath79/mach-wndr4300.c

@@ -116,7 +116,7 @@ static struct gpio_keys_button wndr4300_gpio_keys[] __initdata = {
 	{
 		.desc		= "Wireless button",
 		.type		= EV_KEY,
-		.code		= BTN_0,
+		.code		= KEY_RFKILL,
 		.debounce_interval = WNDR4300_KEYS_DEBOUNCE_INTERVAL,
 		.gpio		= WNDR4300_GPIO_BTN_WIRELESS,
 		.active_low	= 1,