Kconfig: Move API into general setup

This is perhaps not a commonly used feature so should not have its own
option in the main menu. Move it under general setup.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/Kconfig b/Kconfig
index 91170bf..0a2e975 100644
--- a/Kconfig
+++ b/Kconfig
@@ -585,10 +585,10 @@
 	  This provides an option to bringup different processors
 	  in multiprocessor cases.
 
-endmenu		# General setup
-
 source "api/Kconfig"
 
+endmenu		# General setup
+
 source "boot/Kconfig"
 
 source "common/Kconfig"