[PATCH] Convert setup-bus resource allocation to use bus->devices

[PATCH] Convert setup-bus resource allocation to use bus->devices

- Convert setup-bus.c resource allocation to scan bus->devices rather
  than bus->children.  As noted previously, newly discovered child
  buses will not be on the parents list of children buses, so when
  we're trying to assign resources, we need to scan the bus for
  devices with subordinate buses rather than using the list of children
  buses.