PCI addresses are set with qdev_prop_uint32.  Thus we make the QOM
property accept a device and function encoded in an 8-bit integer,
instead of the magic dd.f hex string.
Reviewed-by: NAnthony Liguori <aliguori@us.ibm.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>