ARM: BCM5301X: Add USB LED for Buffalo WZR-1750DHP

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm4708-buffalo-wzr-1750dhp.dts

@@ -47,6 +47,12 @@ hc595: gpio_spi@0 {
 	leds {
 		compatible = "gpio-leds";
 
+		usb {
+			label = "bcm53xx:blue:usb";
+			gpios = <&hc595 0 GPIO_ACTIVE_HIGH>;
+			linux,default-trigger = "default-off";
+		};
+
 		power0 {
 			label = "bcm53xx:red:power";
 			gpios = <&hc595 1 GPIO_ACTIVE_HIGH>;