kconfig: Move CONFIG_OF_LIBFDT to Kconfig

This patch follows work done by:
"Move CONFIG_OF_LIBFDT to Kconfig"
(sha1: 69e173eb57d1f4848f070c83456096ba5d2ba1b4)

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
[trini: Add xpress* to the patch]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/zipitz2_defconfig b/configs/zipitz2_defconfig
index 2977ccc..d2fa63d 100644
--- a/configs/zipitz2_defconfig
+++ b/configs/zipitz2_defconfig
@@ -1,7 +1,9 @@
 CONFIG_ARM=y
 CONFIG_TARGET_ZIPITZ2=y
+CONFIG_SYS_PROMPT="$ "
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_SETEXPR is not set
 # CONFIG_CMD_NET is not set
 # CONFIG_CMD_NFS is not set
-CONFIG_SYS_PROMPT="$ "
+CONFIG_OF_LIBFDT=y
+# CONFIG_EFI_LOADER is not set