01fips: run sha512hmac from directory HMAC file directory
    
    That way, the HMAC file can contain a relative path instead of an
    absolute one. The issue is that right now the kernel RPM bakes the
    `/boot/vmlinuz-${kver}` path into the HMAC file which poses an issue for
    rpm-ostree systems (and any other system where the kernel isn't simply
    in the top-level `/boot`.
    
    For now, we're hacking around this in rpm-ostree:
    https://github.com/coreos/rpm-ostree/pull/1934
    
    Though I'd like to propose the same change in the kernel spec file.
    
    patch_name: 0054.patch
    present_in_specfile: true
    location_in_specfile: 54
    squash_commits: true