treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 71

Based on 1 normalized pattern(s):

  licensed under the gplv2 or later

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 5 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520071859.659568621@linutronix.deSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/iio/adc/at91_adc.c

+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Driver for the ADC present in the Atmel AT91 evaluation boards.
  *
  * Copyright 2011 Free Electrons
- *
- * Licensed under the GPLv2 or later.
  */
 
 #include <linux/bitmap.h>

drivers/iio/adc/nau7802.c

+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Driver for the Nuvoton NAU7802 ADC
  *
  * Copyright 2013 Free Electrons
- *
- * Licensed under the GPLv2 or later.
  */
 
 #include <linux/delay.h>

drivers/video/backlight/hx8357.c

+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Driver for the Himax HX-8357 LCD Controller
  *
  * Copyright 2012 Free Electrons
- *
- * Licensed under the GPLv2 or later.
  */
 
 #include <linux/delay.h>

drivers/video/fbdev/ssd1307fb.c

+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Driver for the Solomon SSD1307 OLED controller
  *
  * Copyright 2012 Free Electrons
- *
- * Licensed under the GPLv2 or later.
  */
 
 #include <linux/backlight.h>

include/linux/platform_data/at91_adc.h

+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * Copyright (C) 2011 Free Electrons
- *
- * Licensed under the GPLv2 or later.
  */
 
 #ifndef _AT91_ADC_H_