treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 203

Based on 1 normalized pattern(s):

  the code contained herein is licensed under the gnu general public
  license v2

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 1 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190528171438.324426348@linutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/arm/boot/dts/imx6q-sbc6x.dts

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright 2013 Pavel Machek <pavel@denx.de>
- *
- * The code contained herein is licensed under the GNU General Public
- * License V2.
  */
 
 /dts-v1/;