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/src/gsm/gea.c b/src/gsm/gea.c
index 70f08ad..5756bb0 100644
--- a/src/gsm/gea.c
+++ b/src/gsm/gea.c
@@ -1,11 +1,11 @@
 /*
- * Copyright (C) 2016 by Sysmocom s.f.m.c. GmbH
+ * Copyright (C) 2016 by sysmocom - s.f.m.c. GmbH
  *
  * All Rights Reserved
  *
  * 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 3 of the License, or
+ * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,