arm64: dts: allwinner: Pine64-LTS: Add status LED

The Pine64-LTS board features a blue status LED on pin PL7.

Describe it in the DT.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210113152630.28810-4-andre.przywara@arm.com

arch/arm64/boot/dts/allwinner/sun50i-a64-pine64-lts.dts

 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
 // Copyright (c) 2018 ARM Ltd.
 
+#include <dt-bindings/leds/common.h>
 #include "sun50i-a64-sopine-baseboard.dts"
 
 / {
 	model = "Pine64 LTS";
 	compatible = "pine64,pine64-lts", "allwinner,sun50i-r18",
 		     "allwinner,sun50i-a64";
+
+	leds {
+		compatible = "gpio-leds";
+
+		led {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_BLUE>;
+			gpios = <&r_pio 0 7 GPIO_ACTIVE_LOW>; /* PL7 */
+		};
+	};
 };