arm64: dts: hisilicon: hi6220-hikey: Allow USR1 LED to notify kernel panic

Blink the LED on a kernel panic.
Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Acked-by: Guodong Xu <guodong.xu@linaro.org>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts

@@ -359,6 +359,7 @@ user_led2 {
 		user_led1 {
 			label = "user_led1";
 			gpios = <&gpio4 3 0>; /* <&gpio_user_led_4>; */
+			panic-indicator;
 			linux,default-trigger = "cpu0";
 		};