libpci: mmio-ports: Add Extended PCIe Intel Type 1 access method

libpci: mmio-ports: Add Extended PCIe Intel Type 1 access method

Extended method allows to access all PCIe registers, including extended
registers starting at 0x100 offset. This method uses 4 reserved buts above
bus bits for PCIe registers. On ARM platforms it is very common for PCIe
controllers. Like standard method, it needs to be properly configured.