Removes most of the uses of pci_dn in the EEH core. There's a few stragglers remaining in pseries specific bits of kernel/eeh*.c mainly the the support for "open sriov" where the hypervisor allows the guest to manage SR-IOV physical functions. We can largely ignore that on non-pseries platforms though.
There'll be a follow up to this which actually removes the use of pci_dn from PowerNV entirely and we can start looking at properly supporting native PCIe. At last. Oliver
