ar71xx: fix TP-LINK TL-WDR3600/4300 RFKILL switch positions

While the switch positions aren't explicitly labeled as on and off, we've heard
complaints about them being wrong. This patch changes the handling to match the
stock firmware.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

SVN-Revision: 44795

target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wdr4300.c

@@ -103,6 +103,7 @@ static struct gpio_keys_button wdr4300_gpio_keys[] __initdata = {
 		.code		= KEY_RFKILL,
 		.debounce_interval = WDR4300_KEYS_DEBOUNCE_INTERVAL,
 		.gpio		= WDR4300_GPIO_BTN_RFKILL,
+		.active_low	= 1,
 	},
 };