treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_385.RULE

Based on the normalized pattern:

    licensed under the gpl v2

extracted by the scancode license scanner the SPDX license identifier

    GPL-2.0-only

has been chosen to replace the boilerplate/reference.
Reviewed-by: Allison Randal <allison@lohutok.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/sparc/vdso/vdso2c.c

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * vdso2c - A vdso image preparation tool
  * Copyright (c) 2014 Andy Lutomirski and others
- * Licensed under the GPL v2
  *
  * vdso2c requires stripped and unstripped input.  It would be trivial
  * to fully strip the input in here, but, for reasons described below,

arch/x86/entry/vdso/vdso2c.c

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * vdso2c - A vdso image preparation tool
  * Copyright (c) 2014 Andy Lutomirski and others
- * Licensed under the GPL v2
  *
  * vdso2c requires stripped and unstripped input.  It would be trivial
  * to fully strip the input in here, but, for reasons described below,

scripts/gcc-plugins/latent_entropy_plugin.c

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright 2012-2016 by the PaX Team <pageexec@freemail.hu>
  * Copyright 2016 by Emese Revfy <re.emese@gmail.com>
- * Licensed under the GPL v2
  *
  * Note: the choice of the license means that the compilation process is
  *       NOT 'eligible' as defined by gcc's library exception to the GPL v3,

scripts/gcc-plugins/stackleak_plugin.c

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright 2011-2017 by the PaX Team <pageexec@freemail.hu>
  * Modified by Alexander Popov <alex.popov@linux.com>
- * Licensed under the GPL v2
  *
  * Note: the choice of the license means that the compilation process is
  * NOT 'eligible' as defined by gcc's library exception to the GPL v3,

scripts/gcc-plugins/structleak_plugin.c

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright 2013-2017 by PaX Team <pageexec@freemail.hu>
- * Licensed under the GPL v2
  *
  * Note: the choice of the license means that the compilation process is
  *       NOT 'eligible' as defined by gcc's library exception to the GPL v3,

tools/power/cpupower/debug/i386/dump_psb.c

-/*
- * dump_psb. (c) 2004, Dave Jones, Red Hat Inc.
- * Licensed under the GPL v2.
- */
+// SPDX-License-Identifier: GPL-2.0-only
+// dump_psb. (c) 2004, Dave Jones, Red Hat Inc.
 
 #include <fcntl.h>
 #include <stdio.h>