efi_loader: hook up in build environment

Now that we have all the bits and pieces ready for EFI payload loading
support, hook them up in Makefiles and KConfigs so that we can build.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
[trini: Enable only when we of OF_LIBFDT, disable on kwb and colibri_pxa270]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/lib/Kconfig b/lib/Kconfig
index 078ef5c..7a45336 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -149,5 +149,6 @@
 	  version of the device tree.
 
 source lib/efi/Kconfig
+source lib/efi_loader/Kconfig
 
 endmenu