redhat: Fix SBAT data in kernel-uki-virt

dracut v107 switched to using 'ukify' for building UKIs. The impementation is, unfortunately, buggy and not 100% backwards compatible, the result is that kernel-uki-virt does not contain the correct SBAT. Fix things by switching to calling ukify explicitly.

Signed-off-by: Vitaly Kuznetsov vkuznets@redhat.com