Restructured PCI subsystem to fit the new device model.

Generic PCI code now handles 64-bit BARs correctly when setting
"membase"; drivers should need to call pci_bar_start() only if they want
to use BARs other than the first memory or I/O BAR.

Split rarely-used PCI functions out into pciextra.c.

Core PCI code is now 662 bytes (down from 1308 bytes in Etherboot 5.4).
284 bytes of this saving comes from the pci/pciextra split.

Cosmetic changes to lots of drivers (e.g. vendor_id->vendor in order to
match the names used in Linux).

src/drivers/net/amd8111e.c

@@ -671,7 +671,7 @@ static int amd8111e_probe(struct nic *nic, struct pci_device *pdev)
 	return 1;
 }
 
-static struct pci_id amd8111e_nics[] = {
+static struct pci_device_id amd8111e_nics[] = {
 	PCI_ROM(0x1022, 0x7462, "amd8111e",	"AMD8111E"),
 };