Nice userspace wrappers for ps2kb driver

ulib/devices/ps2kb.c

@@ -0,0 +1,8 @@
+#include <stdint.h>
+
+#include <sysdefs/ipcpipe.h>
+#include <system/ipcpipe.h>
+
+int32_t dev_ps2kb_read(int32_t *ch) {
+  return ipcpipe(1, 0, IPCPIPE_READ, (uint8_t *)ch, sizeof(*ch));
+}