gpio-keyboard-driver: Add driver

Adds the gpio keyboard driver to the BSP. The driver probes but fails to
find device tree information it is looking for.

Signed-off-by: Nicholas Mello <nick@nmello.dev>

board/arcade.dts

@@ -0,0 +1,8 @@
+#include "broadcom/bcm2711-rpi-4-b.dts"
+
+/ {
+	gpio-keyboard {
+		compatible = "arcade,gpio-keyboard";
+		gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+	};
+};

board/skeleton-device-table.txt

@@ -0,0 +1,4 @@
+# <name>				<type>	<mode>	<uid>	<gid>	<major>	<minor>	<start>	<inc>	<count>
+/etc					d	755	0	0	-	-	-	-	-
+/etc/init.d				d	755	0	0	-	-	-	-	-
+/etc/init.d/S20driver-setup		f	755	0	0	-	-	-	-	-

board/skeleton/etc/init.d/S20driver-setup

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+start() {
+	modprobe gpio_keyboard_driver
+}
+
+stop() {
+	rmmod gpio_keyboard_driver
+}
+
+case "$1" in
+	start)
+		start
+		;;
+	stop)
+		stop
+		;;
+	restart)
+		stop
+		start
+		;;
+esac