Adding AUTHORS and changing copyright headers to refer to it.

Change-Id: I3c2b83e7cd276fd875a497047c5c4f270625e856
diff --git a/hikey/BUILD.gn b/hikey/BUILD.gn
index 4b7c185..8c96c57 100644
--- a/hikey/BUILD.gn
+++ b/hikey/BUILD.gn
@@ -1,4 +1,4 @@
-# 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.
diff --git a/hikey/fdt.S b/hikey/fdt.S
index 77c33e3..8528400 100644
--- a/hikey/fdt.S
+++ b/hikey/fdt.S
@@ -1,5 +1,5 @@
 /*
- * 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.
diff --git a/hikey/initrd.S b/hikey/initrd.S
index fa8ce0c..10f639f 100644
--- a/hikey/initrd.S
+++ b/hikey/initrd.S
@@ -1,5 +1,5 @@
 /*
- * 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.
diff --git a/hikey/plat.c b/hikey/plat.c
index 6701c71..5b6882a 100644
--- a/hikey/plat.c
+++ b/hikey/plat.c
@@ -1,5 +1,5 @@
 /*
- * 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.