dts: Add factory reset button as keybord (button)

Also add a tool useful to test the reset button.

board/aarch64/dts/alder/alder.dtsi

@@ -6,6 +6,7 @@
  * Device tree for Alder board
  */
 
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/leds/common.h>
 
@@ -647,9 +648,19 @@
 	};
 };
 
+/* Reset button */
+/ {
+	gpio-keys {
+		compatible = "gpio-keys";
+		up {
+			label = "factory-reset";
+			linux,code = <KEY_RESTART>;
+			gpios = <&GPIO_RESET_BUTTON>;
+		};
+	};
+};
 
 /* System LEDs */
-
 / {
 	power-a {
 		compatible = "gpio-charger";

configs/aarch64_defconfig

@@ -134,6 +134,7 @@ BR2_PACKAGE_KLISH_PLUGIN_INFIX=y
 BR2_PACKAGE_LOWDOWN=y
 BR2_PACKAGE_TETRIS=y
 BR2_PACKAGE_QUERIERD=y
+BR2_PACKAGE_LIBINPUT=y
 DISK_IMAGE_BOOT_BIN=y
 GNS3_APPLIANCE_RAM=512
 GNS3_APPLIANCE_IFNUM=10