livecd.py: Create /lib64 symlink only for x86_64
kickstart: Adapt to new sddm.conf format
kickstart: Don't set sddm autologin user for now

I want to add some option to the kickstarter configuration se we
can have the default session configured without autologin but this
requires some changes to maui-kickstart so until I do it let's comment
this out.