kernel: debug: Add SPDX license ids to kdb files
Add GPL-2.0 license id to some files related to kdb and kgdb,
replacing references to GPL or COPYING.
These files were introduced into the kernel in 2008 and 2010.
Signed-off-by: Tim Bird <tim.bird@sony.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
authored by