kernel/selinux-testsuite: remove libbpf-devel CRB workaround
    
    On Beaker the repo has a different name and CRB is enabled there anyway.
    This workaround is only useful with the internal 1minutetip tool, so
    it's not worth keeping it here.
    
    Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>