Add missing gpio include to ps2 vendor (#22063)

platforms/chibios/drivers/vendor/RP/RP2040/ps2_vendor.c

@@ -1,6 +1,7 @@
 // Copyright 2022 Marek Kraus (@gamelaster)
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include "gpio.h"
 #include "hardware/pio.h"
 #include "hardware/clocks.h"
 #include "ps2.h"