LICENSES: add CC0-1.0 license text

Commit cbbd847d107f ("tools/x86/kcpuid: Introduce a complete cpuid
bitfields CSV file") turns the tools/arch/x86/kcpuid/cpuid.csv to be an
auto-generated file from an input file maintained at x86-cpuid.org project.
The x86-cpuid.org project clearly states that the auto-generated file is to
be licensed with CC0-1.0 (see Link below). So, the SPDX-License-Identifier
CC0-1.0 in the file is correct as intended.

The spdxcheck.py script reports that tools/arch/x86/kcpuid/cpuid.csv uses
an Invalid License ID: CC0-1.0, though, as the LICENSES directory in the
kernel tree does not contain a file with license information for CC0-1.0.

Add a suitable CC0-1.0 file with the license text into LICENSES/deprecated
to make spdxcheck.py happy.

The directory deprecated is the best fit, by exclusion of the
alternatives. CC0-1.0 should not be considered among the preferred licenses
in the kernel, nor is it a license exception case or intended for
dual-licensing some copyrighted material. So, deprecated is the best fit
here, even if the license and its use is fine and it does not suggest to
actually deprecate use of this license.

The license text for the CC0-1.0 file was obtained from the spdx
license-list-data git repository (see Link below).

Link: https://gitlab.com/x86-cpuid.org/x86-cpuid-db/-/blob/v2.4/LICENSE.rst
Link: https://github.com/spdx/license-list-data/blob/main/text/CC0-1.0.txt

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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