PCI: Use standard PCIe Capability Link register field names

Use the standard #defines for PCIe Link Status and Capability registers
rather than bare numbers.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/probe.c

@@ -521,7 +521,7 @@ static unsigned char pcie_link_speed[] = {
 
 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
 {
-	bus->cur_bus_speed = pcie_link_speed[linksta & 0xf];
+	bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS];
 }
 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
 
@@ -610,7 +610,7 @@ static void pci_set_bus_speed(struct pci_bus *bus)
 		u16 linksta;
 
 		pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
-		bus->max_bus_speed = pcie_link_speed[linkcap & 0xf];
+		bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS];
 
 		pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
 		pcie_update_link_speed(bus, linksta);