More implement of PciScanBus, now read hack flags from table (PciGetHAckFlags), and...

More implement of PciScanBus, now read hack flags from table (PciGetHAckFlags), and check for critical device (PciIsCriticalDeviceClass) and VGA device on PCI bridge
Do check for skipping some function (double decker ghost, Intel Alder SMP Pentium Pro machine, hacl flag, more), PciSkipThisfunction
Do check for PDO already exist for function (PciFindPdoByFunction)
Finish impement PciFindParentPciFdoExtension

svn path=/trunk/; revision=48098