avb: move SPDX license identifiers to the first line

Move SPDX license identifiers to the first line, so it conforms
to license placement rule [1]:

Placement:
The SPDX license identifier in kernel files shall be added at the first
possible line in a file which can contain a comment.  For the majority
of files this is the first line, except for scripts which require the
'#!PATH_TO_INTERPRETER' in the first line.  For those scripts the SPDX
identifier goes into the second line.

[1] https://www.kernel.org/doc/Documentation/process/license-rules.rst

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
Link: https://lore.kernel.org/r/20240209192045.3961832-3-igor.opaniuk@foundries.io
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

cmd/avb.c

@@ -1,8 +1,6 @@
-
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2018, Linaro Limited
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <avb_verify.h>

common/avb_verify.c

@@ -1,7 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2018, Linaro Limited
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include <avb_verify.h>

include/avb_verify.h

@@ -1,8 +1,6 @@
-
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) Copyright 2018, Linaro Limited
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #ifndef	_AVB_VERIFY_H

test/py/tests/test_android/test_avb.py

@@ -1,6 +1,5 @@
-# Copyright (c) 2018, Linaro Limited
-#
 # SPDX-License-Identifier:  GPL-2.0+
+# Copyright (c) 2018, Linaro Limited
 #
 # Android Verified Boot 2.0 Test