cfg: remove creation from hekate and move to Nyx

There's no reason for hekate to create the hekate config if missing, since Nyx is the sole manager of it.

So move the auto creation there to save binary space.

bootloader/config.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2021 CTCaer
+ * Copyright (c) 2018-2022 CTCaer
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -42,6 +42,5 @@ typedef struct _hekate_config
 } hekate_config;
 
 void set_default_configuration();
-int create_config_entry();
 
 #endif /* _CONFIG_H_ */