s390/pci/hotplug: convert to be builtin only

Convert s390' pci hotplug to be builtin only, with no module option.

Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/pci/hotplug/Kconfig b/drivers/pci/hotplug/Kconfig
index d85009d..0a648af 100644
--- a/drivers/pci/hotplug/Kconfig
+++ b/drivers/pci/hotplug/Kconfig
@@ -146,7 +146,7 @@
 	  When in doubt, say N.
 
 config HOTPLUG_PCI_S390
-	tristate "System z PCI Hotplug Support"
+	bool "System z PCI Hotplug Support"
 	depends on S390 && 64BIT
 	help
 	  Say Y here if you want to use the System z PCI Hotplug