Add Server disk image for aarch64

This is a generic disk image that should be usable on any architecture with
imagefactory or live-media-creator (possibly with package tweaks).

Minor tweaks to the autopart across Minimal/Workstation for Server defaults.

Signed-off-by: Peter Robinson <pbrobinson@fedoraproject.org>

fedora-disk-workstation.ks

@@ -4,6 +4,8 @@
 
 bootloader --append="cma=256MB"
 
+autopart --type=plain
+
 %packages
 -initial-setup
 -initial-setup-gui