ARM: dts: sun8i: h3: beelink-x2: Add power button

Beelink X2 has power button. Add node for it.
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210323204341.28825-1-jernej.skrabec@siol.net

arch/arm/boot/dts/sun8i-h3-beelink-x2.dts

@@ -111,6 +111,17 @@ spdif_out: spdif-out {
 		#sound-dai-cells = <0>;
 		compatible = "linux,spdif-dit";
 	};
+
+	r-gpio-keys {
+		compatible = "gpio-keys";
+
+		power {
+			label = "power";
+			linux,code = <KEY_POWER>;
+			gpios = <&r_pio 0 3 GPIO_ACTIVE_LOW>;
+			wakeup-source;
+		};
+	};
 };
 
 &de {