treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 480

Based on 1 normalized pattern(s):

  adapted from oprofile gplv2 support

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to add the SPDX license identifier to 1 file(s)
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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/20190604081204.397687630@linutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/perf/util/jitdump.h

+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * jitdump.h: jitted code info encapsulation file format
  *