PCI: pci-label: Fix build failure when CONFIG_NLS is set to 'm' by allmodconfig

Create a kconfig option symbol for PCI_LABEL and enable it
when DMI || ACPI are enabled.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index c8ff646..0fa466a 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -88,4 +88,6 @@
 	depends on HOTPLUG
 	default y
 
-select NLS if (DMI || ACPI)
+config PCI_LABEL
+	def_bool y if (DMI || ACPI)
+	select NLS