km: fixed typo in KM Kirkwood header file

A typo in the km_kirkwood.h header prevented to undefine the initialization
of the Kirkwood PCIe interface.

Signed-off-by: Pascal Linder <pascal.linder@edu.hefr.ch>
Signed-off-by: Holger Brunck <holger.brunck@ch.abb.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/km_kirkwood.h b/include/configs/km_kirkwood.h
index b679701..92b0590 100644
--- a/include/configs/km_kirkwood.h
+++ b/include/configs/km_kirkwood.h
@@ -144,7 +144,7 @@
 	MVGBE_SET_MII_SPEED_TO_100)
 #endif
 
-#ifdef CONFIG_KM_DISABLE_PCI
+#ifdef CONFIG_KM_DISABLE_PCIE
 #undef  CONFIG_KIRKWOOD_PCIE_INIT
 #endif