cpu: define sub-leaf 0 for leaf 7 in cpu_map.xml
cpu: define sub-leaf 0 for leaf 7 in cpu_map.xml

CPUID leaf 7 is sub-leaf aware. Add missing attribute.

Signed-off-by: Marek Marczykowski-Górecki <b37867d4e08020cf5bb17f05a2c036fbc82d5481@invisiblethingslab.com>
Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

olafhering/libvirt,jardasgit/libvirt,libvirt/libvirt,olafhering/libvirt,jardasgit/libvirt,zippy2/libvirt,jfehlig/libvirt,eskultety/libvirt,datto/libvirt,eskultety/libvirt,zippy2/libvirt,jardasgit/libvirt,nertpinx/libvirt,datto/libvirt,crobinso/libvirt,libvirt/libvirt,zippy2/libvirt,nertpinx/libvirt,libvirt/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,datto/libvirt,fabianfreyer/libvirt,eskultety/libvirt,andreabolognani/libvirt,nertpinx/libvirt,crobinso/libvirt,fabianfreyer/libvirt,crobinso/libvirt,andreabolognani/libvirt,nertpinx/libvirt,andreabolognani/libvirt,datto/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,eskultety/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,crobinso/libvirt,jardasgit/libvirt,olafhering/libvirt,nertpinx/libvirt,andreabolognani/libvirt,jfehlig/libvirt,zippy2/libvirt,libvirt/libvirt,eskultety/libvirt,olafhering/libvirt,jardasgit/libvirt,datto/libvirt