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/oap/oap_test.c b/tests/oap/oap_test.c
index 0c4c16e..dea5c11 100644
--- a/tests/oap/oap_test.c
+++ b/tests/oap/oap_test.c
@@ -1,9 +1,9 @@
 /* Test Osmocom Authentication Protocol */
 /*
- * (C) 2016 by sysmocom s.f.m.c. GmbH
+ * (C) 2016 by sysmocom - s.f.m.c. GmbH
+ * Author: Neels Hofmeyr
  * All Rights Reserved
  *
- * Author: Neels Hofmeyr
  *
  * 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