pci: takes into account the 64bit address type

* when the 64bit address type is used, it means a BAR takes the size of two.
For the moment we just set the next base_registers to the high address
and skip to the next valid BAR. The struct is now zeroed on creation.
* the pci device information is more correct now, though it would be easier
to have BAR address and size with a 64bit types in the struct pci_info.