Fix/Update copyright notices; Add SPDX annotation

Let's fix some erroneous/accidential references to wrong license,
update copyright information where applicable and introduce a
SPDX-License-Identifier to all files.

Change-Id: I39af26c6aaaf5c926966391f6565fc5936be21af
diff --git a/tests/lapd/lapd_test.c b/tests/lapd/lapd_test.c
index 0dccaa4..d6c0495 100644
--- a/tests/lapd/lapd_test.c
+++ b/tests/lapd/lapd_test.c
@@ -1,9 +1,11 @@
 /*
  * (C) 2011 by Holger Hans Peter Freyther
  * (C) 2011 by On-Waves
- * (C) 2014 by Daniel Willmann <dwillmann@sysmocom.de>
+ * (C) 2014 by sysmocom - s.f.m.c. GmbH, Author: Daniel Willmann <dwillmann@sysmocom.de>
  * All Rights Reserved
  *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
  * 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