Adding AUTHORS and changing copyright headers to refer to it.

Change-Id: Id3306370911baf01bd2137dc0fbc8c421682e9f7
diff --git a/build/image/generate_initrd.py b/build/image/generate_initrd.py
index 5e89e63..a49865a 100644
--- a/build/image/generate_initrd.py
+++ b/build/image/generate_initrd.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2018 Google LLC
+# Copyright 2018 The Hafnium Authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.