cosmetic: Update copyright statement, license notice and SPDX
Some of our files didn't have a copyright notice at all, let's add
it. Also, update the notices in other files and ensure a SPDX
identifier is present in all but the most trivial files.
Change-Id: If7fa19ce484b415bc645e39b3d0d666b44b5f0fd
diff --git a/bts/BTS_Tests_SMSCB.ttcn b/bts/BTS_Tests_SMSCB.ttcn
index 801a5fc..0712a90 100644
--- a/bts/BTS_Tests_SMSCB.ttcn
+++ b/bts/BTS_Tests_SMSCB.ttcn
@@ -7,6 +7,8 @@
* Released under the terms of GNU General Public License, Version 2 or
* (at your option) any later version.
*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
* This test suite tests the SMSCB (Cell Broadcast) related functionality of
* OsmoBTS by attaching to the A-bis RSL and Um interface and emulating both
* BSC and MS.