Initial aarch64 compose enablement on primary koji
    
    This is the initial enablement for aarch64 on rawhide. It adds:
    * repos/net install for Everything/Cloud/Server/Workstation
    * Server DVD installs
    
    It also cleans up the config a little, remove s390(x) multilib, orders
    architectures alphabetically so they're consistent and a litte easier to
    read thoughout variants-fedora.xml.
    
    What is still outstanding:
    * Add configs for slicing up the compose output and sync out to mirror locations
    * Cloud and Docker images
    * Disk images
    
    The first item will be a new PR, the later two are being worked upon.
    
    Signed-off-by: Peter Robinson <pbrobinson@gmail.com>