Add SPDX-License-Identifier to all source files

Change-Id: I9f2bc8c5d8a2c0bb0dd6caa4de5e2cb11be210e7
diff --git a/tests/ipa_recv/ipa_recv_test.c b/tests/ipa_recv/ipa_recv_test.c
index 0f56926..33cdcea 100644
--- a/tests/ipa_recv/ipa_recv_test.c
+++ b/tests/ipa_recv/ipa_recv_test.c
@@ -2,10 +2,12 @@
 
 /*
  * (C) 2014 by On-Waves
- * (C) 2014 by sysmocom s.f.m.c. GmbH
+ * (C) 2014 by sysmocom - s.f.m.c. GmbH
  *
  * All Rights Reserved
  *
+ * SPDX-License-Identifier: AGPL-3.0+
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
  * the Free Software Foundation; either version 3 of the License, or