PCI: Add support for reporting PCIe 3.0 speeds

Add the 8.0 GT/s speed.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c
index c7260d4..49c9e6c 100644
--- a/drivers/pci/slot.c
+++ b/drivers/pci/slot.c
@@ -71,6 +71,7 @@
 	"133 MHz PCI-X 533",	/* 0x13 */
 	"2.5 GT/s PCIe",	/* 0x14 */
 	"5.0 GT/s PCIe",	/* 0x15 */
+	"8.0 GT/s PCIe",	/* 0x16 */
 };
 
 static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf)