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>

scripts/sanity_chk/harness.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: Apache-2.0
 import re
 from collections import OrderedDict
 

scripts/sanity_chk/ini2yaml.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-
+# SPDX-License-Identifier: Apache-2.0
 import ConfigParser, os
 import yaml
 import sys

scripts/sanity_chk/scl.py

@@ -1,5 +1,6 @@
 #! /usr/bin/python
 #
+# SPDX-License-Identifier: Apache-2.0
 # Zephyr's Sanity Check library
 #
 # Set of code that other projects can also import to do things on