Change interface to PcieDev to use lseek

[killenb]

Currently DeviceAccess is using the legacy interface with ioctl when using the PcieDev driver. It shoud be changed to read/write. Notice: Although the mechanism is the same as for PcieUni, the address offsets for the bars are different because pciedev also allows 8, 16 (and 64?) bit access, not only 32 bits. As DeviceAccess is limited to 32 bits, only this will be implemented.