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>;
+	};
+};