treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 186

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation software distributed under
  the license is distributed on an as is basis without warranty of any
  kind either express or implied see the license for the specific
  language governing rights and limitations under the license

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4 file(s).

Bucket: ASIS-2

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

4 files changed