meta-skeleton/hello-mod: Switch to SPDX-License-Identifier

(From OE-Core rev: bb43462b0fcd510582c4c6f1081bb2f3f0c63843)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-skeleton/recipes-kernel/hello-mod/files/hello.c

@@ -2,18 +2,7 @@
  *
  *   Copyright (C) 2011  Intel Corporation. All rights reserved.
  *
- *   This program is free software;  you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; version 2 of the License.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
- *   the GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License
- *   along with this program;  if not, write to the Free Software
- *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *   SPDX-License-Identifier: GPL-2.0-only
  *
  *****************************************************************************/