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/support/quartus-flash.py b/scripts/support/quartus-flash.py
index 5ae7dcf..f4aadf0 100755
--- a/scripts/support/quartus-flash.py
+++ b/scripts/support/quartus-flash.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 
+# SPDX-License-Identifier: Apache-2.0
 import subprocess
 import tempfile
 import argparse