thermald is x86_64 only
    
    As with mcelog and microcode_ctl, add it to the blocklist and
    list it manually in packages-x86_64 in fedora-common-ostree.yaml
    instead. This should fix non-x86_64 arches which are failing
    because they can't find it.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>