treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 440
-rw-r--r-- 14943 .clang-format
-rw-r--r-- 59 .cocciconfig
-rw-r--r-- 71 .get_maintainer.ignore
-rw-r--r-- 30 .gitattributes
-rw-r--r-- 1658 .gitignore
-rw-r--r-- 12206 .mailmap
-rw-r--r-- 423 COPYING
-rw-r--r-- 99486 CREDITS
drwxr-xr-x - Documentation
-rw-r--r-- 1513 Kbuild
-rw-r--r-- 563 Kconfig
drwxr-xr-x - LICENSES
-rw-r--r-- 511934 MAINTAINERS
-rw-r--r-- 60208 Makefile
-rw-r--r-- 727 README
drwxr-xr-x - arch
drwxr-xr-x - block
drwxr-xr-x - certs
drwxr-xr-x - crypto
drwxr-xr-x - drivers
drwxr-xr-x - fs
drwxr-xr-x - include
drwxr-xr-x - init
drwxr-xr-x - ipc
drwxr-xr-x - kernel
drwxr-xr-x - lib
drwxr-xr-x - mm
drwxr-xr-x - net
drwxr-xr-x - samples
drwxr-xr-x - scripts
drwxr-xr-x - security
drwxr-xr-x - sound
drwxr-xr-x - tools
drwxr-xr-x - usr
drwxr-xr-x - virt