Add missing copyright notices to recently created files

Add copyright notices for new CLI code (2023), the AMD SPI100
driver (2023), and new SPI support code for dual/quad i/o and
QPI (2024). Initially, some code was moved from `flashprog.c`
into `spi25_prepare.c` which dates back to 2017 and 2018.

Change-Id: I980382b8950e2aea6880f4b56df23d4eafc6bb3d
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/318
Tested-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/cli_wp.c b/cli_wp.c
index 429fffa..d6c5ed7 100644
--- a/cli_wp.c
+++ b/cli_wp.c
@@ -1,6 +1,8 @@
 /*
  * This file is part of the flashprog project.
  *
+ * Copyright (C) 2023 Nico Huber <nico.h@gmx.de>
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or