KeyboardSettings+Kernel: Setting to enable Num Lock on login

Kernel/Syscalls/num_lock.cpp

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/Devices/HID/HIDManagement.h>
+#include <Kernel/Process.h>
+
+namespace Kernel {
+
+KResultOr<FlatPtr> Process::sys$set_num_lock(bool on)
+{
+    HIDManagement::the().set_num_lock(on);
+    return 0;
+}
+
+}