libavb: Update SPDX tag style

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/lib/libavb/avb_rsa.h b/lib/libavb/avb_rsa.h
index f5c6a9c..8741790 100644
--- a/lib/libavb/avb_rsa.h
+++ b/lib/libavb/avb_rsa.h
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: MIT OR BSD-3-Clause */
 /*
  * Copyright (C) 2016 The Android Open Source Project
- *
- * SPDX-License-Identifier:	(MIT or BSD-3-Clause)
  */
 
 /* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.