add extern for pci_root_ops
delete our version of the pci_root_ops code
make pci_root_ops non static

Ack-by: Matthew Wilcox
Ack-by: Jesse Barnes
Ack-by: Grant Grundler
Signed-off-by: Patrick Gefre <pfg@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>