kasan: add SPDX-License-Identifier mark to source files

This patch adds a "SPDX-License-Identifier: GPL-2.0" mark to all source
files under mm/kasan.

Link: http://lkml.kernel.org/r/bce2d1e618afa5142e81961ab8fa4b4165337380.1544099024.git.andreyknvl@google.comSigned-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/kasan/common.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file contains common generic and tag-based KASAN code.
  *

mm/kasan/generic.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file contains core generic KASAN code.
  *

mm/kasan/generic_report.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file contains generic KASAN specific error reporting code.
  *

mm/kasan/init.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file contains some kasan initialization code.
  *

mm/kasan/quarantine.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * KASAN quarantine.
  *

mm/kasan/report.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file contains common generic and tag-based KASAN error reporting code.
  *

mm/kasan/tags.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file contains core tag-based KASAN code.
  *

mm/kasan/tags_report.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file contains tag-based KASAN specific error reporting code.
  *