redhat/kernel.spec: fix file listed twice warning for "kernel" subdir

Jan Stancekrequested to merge
jstancek/kernel-ark:file_listed_twice_warning into os-build

Address the warnings like: File listed twice: /lib/modules/6.11.0-0.rc0.66ebbdfd.10.test.el10.x86_64/kernel

Signed-off-by: Jan Stancek jstancek@redhat.com

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