pci: move pci host stuff from pci.c to pci_host.c Move pci host stuff from pci.c to pci_host.c. And add some comments. Later pcie host bridge functions will be defined in pcie_host.c not to bloat pci.c. Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>