PCI hotplug: add support for 5.0G link speed

Add support for PCI-E 5.0 GT/s in max_bus_speed and cur_bus_speed.

Reviewed-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/include/linux/pci_hotplug.h b/include/linux/pci_hotplug.h
index 4391741..1b00cc3 100644
--- a/include/linux/pci_hotplug.h
+++ b/include/linux/pci_hotplug.h
@@ -62,7 +62,8 @@
 };
 
 enum pcie_link_speed {
-	PCIE_2PT5GB		= 0x14,
+	PCIE_2_5GB		= 0x14,
+	PCIE_5_0GB		= 0x15,
 	PCIE_LNK_SPEED_UNKNOWN	= 0xFF,
 };