virtio_pci: delete vqs indirectly
virtio_pci: delete vqs indirectly

VQ deletion is mostly version-specific, add another level of indirection
to split the version-independent code out.

Signed-off-by: Michael S. Tsirkin <255103e50249e3d658441816e0597170ebfc16ef@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs