[redhat] kernel.spec: add 0BSD to allowed licenses

Patrick Talbertrequested to merge
ptalbert/kernel-ark:licence_0BSD into os-build

As of 836d13a6 ('xz: switch from public domain to BSD Zero Clause License (0BSD)') xz is now using this license.

Signed-off-by: Patrick Talbert ptalbert@redhat.com

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