Remove knowledge of QOM innards. The common part of pci_bus_new and
pci_bus_new_inplace is moved to a new function pci_bus_init.
Acked-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>