arm/km: add board type to boards.cfg

Some other kirkwood boards from keymile will follow. They will have some
small differences, but we want to use the km_kirkwood.h for all to
distinguish them. This patch a preparation for this.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Gerlando Falauto <gerlando.falauto@keymile.com>
cc: Prafulla Wadaskar <prafulla@marvell.com>
diff --git a/include/configs/km_kirkwood.h b/include/configs/km_kirkwood.h
index ed36124..f639edc 100644
--- a/include/configs/km_kirkwood.h
+++ b/include/configs/km_kirkwood.h
@@ -42,10 +42,10 @@
 /*
  * Version number information
  */
-#ifdef CONFIG_KM_DISABLE_PCI
+#if defined(CONFIG_KM_KIRKWOOD)
 #define CONFIG_IDENT_STRING	"\nKeymile Kirkwood"
 #undef  CONFIG_KIRKWOOD_PCIE_INIT
-#else
+#elif defined(CONFIG_KM_KIRKWOOD_PCI)
 #define CONFIG_IDENT_STRING	"\nKeymile Kirkwood PCI"
 #endif