treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_149.RULE

treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_149.RULE

Based on the normalized pattern:

    netapp provides this source code under the gpl v2 license the gpl v2
    license is available at https://opensource org/licenses/gpl-license
    php  this software is provided by the copyright holders and
    contributors as is and any express or implied warranties including but
    not limited to the implied warranties of merchantability and fitness
    for a particular purpose are disclaimed in no event shall the
    copyright owner or contributors be liable for any direct indirect
    incidental special exemplary or consequential damages (including but
    not limited to procurement of substitute goods or services loss of use
    data or profits or business interruption) however caused and on any
    theory of liability whether in contract strict liability or tort
    (including negligence or otherwise) arising in any way out of the use
    of this software even if advised of the possibility of such damage

extracted by the scancode license scanner the SPDX license identifier

    GPL-2.0-only

has been chosen to replace the boilerplate/reference.

Reviewed-by: Allison Randal <allison@lohutok.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>