license: cleanup: add SPDX Apache-2.0 license identifier
Update the files which contain no license information with the
'Apache-2.0' SPDX license identifier. Many source files in the tree are
missing licensing information, which makes it harder for compliance
tools to determine the correct license.
By default all files without license information are under the default
license of Zephyr, which is Apache version 2.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/scripts/subfolder_list.py b/scripts/subfolder_list.py
index 10aa984..76927fb 100644
--- a/scripts/subfolder_list.py
+++ b/scripts/subfolder_list.py
@@ -1,4 +1,5 @@
#!/usr/bin/env python3
+# SPDX-License-Identifier: Apache-2.0
import os
import argparse
