Undo decision to store pci_info in `Device`
Undo decision to store pci_info in `Device`

I've instead chosen to go the much simpler route of having the user pass in `None` (call will grab `PciInfo` for you) or `PciInfo` that they already have (call will utilize this pre-existing info).

Cldfire/nvml-wrapper,Cldfire/nvml-wrapper