treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 232

Based on 1 normalized pattern(s):

  licensed under the gnu general public license version 2 0 gplv2

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 3 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Armijn Hemel <armijn@tjaldur.nl>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Enrico Weigelt <info@metux.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190602204653.630925848@linutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/bpf/bpf_asm.c

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Minimal BPF assembler
  *
@@ -16,7 +17,6 @@
  *    pretty print a C-like construct.
  *
  * Copyright 2013 Daniel Borkmann <borkmann@redhat.com>
- * Licensed under the GNU General Public License, version 2.0 (GPLv2)
  */
 
 #include <stdbool.h>

tools/bpf/bpf_dbg.c

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Minimal BPF debugger
  *
@@ -28,7 +29,6 @@
  *  7) > step [-<n>, +<n>] (performs single stepping through the BPF)
  *
  * Copyright 2013 Daniel Borkmann <borkmann@redhat.com>
- * Licensed under the GNU General Public License, version 2.0 (GPLv2)
  */
 
 #include <stdio.h>

tools/bpf/bpf_jit_disasm.c

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Minimal BPF JIT image disassembler
  *
@@ -11,7 +12,6 @@
  *  3) Run e.g. `bpf_jit_disasm -o` to read out the last JIT code
  *
  * Copyright 2013 Daniel Borkmann <borkmann@redhat.com>
- * Licensed under the GNU General Public License, version 2.0 (GPLv2)
  */
 
 #include <stdint.h>