Define PCI vendor and device IDs in pci.h (Stuart Brady)

Define PCI vendor and device IDs in pci.h (Stuart Brady)

This patch defines PCI vendor and device IDs in pci.h (matching those
from Linux's pci_ids.h), and uses those definitions where appropriate.

Change from v1:
  Introduces pci_config_set_vendor_id() / pci_config_set_device_id()
  accessors as suggested by Anthony Liguori.

Signed-off-by: Stuart Brady <stuart.brady@gmail.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6442 c046a42c-6fe2-441c-8c8c-71466251a162