kernel: debug: Convert to SPDX identifier

use SPDX-License-Identifier instead of a verbose license text
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Link: https://lore.kernel.org/r/20210906112302.937-1-caihuoqing@baidu.comSigned-off-by: Daniel Thompson <daniel.thompson@linaro.org>

kernel/debug/debug_core.c

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Kernel Debug Core
  *
@@ -22,10 +23,6 @@
  *
  * Original KGDB stub: David Grothe <dave@gcom.com>,
  * Tigran Aivazian <tigran@sco.com>
- *
- * This file is licensed under the terms of the GNU General Public License
- * version 2. This program is licensed "as is" without any warranty of any
- * kind, whether express or implied.
  */
 
 #define pr_fmt(fmt) "KGDB: " fmt

kernel/debug/gdbstub.c

+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Kernel Debug Core
  *
@@ -22,10 +23,6 @@
  *
  * Original KGDB stub: David Grothe <dave@gcom.com>,
  * Tigran Aivazian <tigran@sco.com>
- *
- * This file is licensed under the terms of the GNU General Public License
- * version 2. This program is licensed "as is" without any warranty of any
- * kind, whether express or implied.
  */
 
 #include <linux/kernel.h>