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/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