ar71xx: add wireless bgn led support for dir-825-c1

I checked the GPL code drop from D-Link and tried to get the wireless
and LAN switch LEDs to light up. I found some references in
AthSDK/www/DIR-825_C1/bsp.h as well as
AthSDK/www/DIR-825_C1/rootfs/etc/sysconfig/S2gpio.sh, but in the end I
only got the led for 2.4GHz to work. Anyway, here's the patch.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 37963

target/linux/ar71xx/files/arch/mips/ath79/mach-dir-825-c1.c

@@ -34,6 +34,7 @@
 #define DIR825C1_GPIO_LED_BLUE_WPS		15
 #define DIR825C1_GPIO_LED_ORANGE_PLANET		19
 #define DIR825C1_GPIO_LED_BLUE_PLANET		18
+#define DIR825C1_GPIO_LED_WIFI_BGN		13
 
 #define DIR825C1_GPIO_BTN_RESET			17
 #define DIR825C1_GPIO_BTN_WPS			16
@@ -76,6 +77,10 @@ static struct gpio_led dir825c1_leds_gpio[] __initdata = {
 		.name		= "d-link:blue:planet",
 		.gpio		= DIR825C1_GPIO_LED_BLUE_PLANET,
 		.active_low	= 1,
+	}, {
+		.name		= "d-link:blue:wifi_bgn",
+		.gpio		= DIR825C1_GPIO_LED_WIFI_BGN,
+		.active_low	= 1,
 	},
 };