ramips: WAN LED for D-Link DIR-300-B1

Add led devices for D-Link DIR-300-B1 WAN LED.

Note that the GPIO state is also ANDed with the esw switch port 4
LED state, which is why I've set the amber LED to default-on.

Closes: https://dev.openwrt.org/ticket/11326

Signed-off-by: Tobias Diedrich <ranma+openwrt@tdiedrich.de>

[ juhosg:
- fix comment style in mach-dir-300-revb.c,
- remove the PPP specific LED setup, not everyone uses a PPP connection
  on the WAN interface]

SVN-Revision: 31989

target/linux/ramips/files/arch/mips/ralink/rt305x/mach-dir-300-revb.c

@@ -22,6 +22,12 @@
 #define DIR_300B_GPIO_LED_STATUS_AMBER	8
 #define DIR_300B_GPIO_LED_STATUS_GREEN	9
 #define DIR_300B_GPIO_LED_WPS		13
+/*
+ * NOTE: The wan led is also connected to the switch, both
+ * switch and gpio must be active to make it light up
+ */
+#define DIR_300B_GPIO_LED_WAN_GREEN	12
+#define DIR_300B_GPIO_LED_WAN_AMBER	14
 
 #define DIR_300B_GPIO_BUTTON_WPS	0	/* active low */
 #define DIR_300B_GPIO_BUTTON_RESET	10	/* active low */
@@ -38,6 +44,14 @@ static struct gpio_led dir_300b_leds_gpio[] __initdata = {
 		.name		= "d-link:green:status",
 		.gpio		= DIR_300B_GPIO_LED_STATUS_GREEN,
 		.active_low	= 1,
+	}, {
+		.name		= "d-link:amber:wan",
+		.gpio		= DIR_300B_GPIO_LED_WAN_AMBER,
+		.active_low	= 1,
+	}, {
+		.name		= "d-link:green:wan",
+		.gpio		= DIR_300B_GPIO_LED_WAN_GREEN,
+		.active_low	= 1,
 	}, {
 		.name		= "d-link:blue:wps",
 		.gpio		= DIR_300B_GPIO_LED_WPS,