qemu: Default to GIC v2
qemu: Default to GIC v2

When a domain is configured to use GIC but no version has been
specified by the user, default to GIC v2.

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