pci: drop unused Kconfig symbol

There's no other Kconfig symbol that depends on XEN_PCIDEV_FE_DEBUG.
Neither is there anything that uses CONFIG_XEN_PCIDEV_FE_DEBUG.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

drivers/pci/Kconfig

@@ -51,17 +51,6 @@ config XEN_PCIDEV_FRONTEND
           The PCI device frontend driver allows the kernel to import arbitrary
           PCI devices from a PCI backend to support PCI driver domains.
 
-config XEN_PCIDEV_FE_DEBUG
-        bool "Xen PCI Frontend debugging"
-        depends on XEN_PCIDEV_FRONTEND && PCI_DEBUG
-	help
-	  Say Y here if you want the Xen PCI frontend to produce a bunch of debug
-	  messages to the system log.  Select this if you are having a
-	  problem with Xen PCI frontend support and want to see more of what is
-	  going on.
-
-	  When in doubt, say N.
-
 config HT_IRQ
 	bool "Interrupts on hypertransport devices"
 	default y