Relicense Hafnium under the BSD 3 clause license.

Updates to the rest of the links in the documentation will follow in a
separate patch.

Change-Id: I52e35dad8fa12be48df5459a5fc8521adc53d55b
Signed-off-by: Andrew Walbran <qwandor@google.com>
diff --git a/inc/hf/fdt_handler.h b/inc/hf/fdt_handler.h
index 8cf3a4a..8fe0831 100644
--- a/inc/hf/fdt_handler.h
+++ b/inc/hf/fdt_handler.h
@@ -1,17 +1,9 @@
 /*
  * 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.
- * You may obtain a copy of the License at
- *
- *     https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/BSD-3-Clause.
  */
 
 #pragma once