license: Remove non-copyrightable license

The generated configs.c is technically not copyrightable since it's
using the configs selected by the end user which might not fall under
the Apache license. This license header in the generated file is causing
us issues downstream from a legal perspective. It's important to note
that other generated files in Zephyr don't include the copyright header.

Fixes #86259

Signed-off-by: Yuval Peress <peress@google.com>

misc/generated/configs.c.in

@@ -1,7 +1,3 @@
-/*
- * SPDX-License-Identifier: Apache-2.0
- */
-
 /* file is auto-generated, do not modify ! */
 
 #include <zephyr/toolchain.h>