libavb: Update SPDX tag style

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/lib/libavb/avb_property_descriptor.h b/lib/libavb/avb_property_descriptor.h
index 2a70896..917c58f 100644
--- a/lib/libavb/avb_property_descriptor.h
+++ b/lib/libavb/avb_property_descriptor.h
@@ -1,7 +1,6 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * Copyright (C) 2016 The Android Open Source Project
- *
- * SPDX-License-Identifier:	MIT
  */
 
 #if !defined(AVB_INSIDE_LIBAVB_H) && !defined(AVB_COMPILATION)