arm64: dts: allwinner: a64: NanoPi-A64: Add blue status LED

Beside the non-controllable green power LED, the NanoPi-A64 features a
blue "status" LED, connected to PD24.

Add the device tree node to make it usable.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

arch/arm64/boot/dts/allwinner/sun50i-a64-nanopi-a64.dts

@@ -59,6 +59,15 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
+	leds {
+		compatible = "gpio-leds";
+
+		blue {
+			label = "nanopi-a64:blue:status";
+			gpios = <&pio 3 24 GPIO_ACTIVE_LOW>; /* PD24 */
+		};
+	};
+
 	wifi_pwrseq: wifi_pwrseq {
 		compatible = "mmc-pwrseq-simple";
 		clocks = <&rtc 1>;