We need to build u-boot tools without a board configuration for the target.
fw_env just uses config.h to define the default environment of the created
image, so it really isn't mandatory.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff --git a/tools/env/fw_env.h b/tools/env/fw_env.h
index aff471b..dfe7439 100644
--- a/tools/env/fw_env.h
+++ b/tools/env/fw_env.h
@@ -5,14 +5,6 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
-/* Pull in the current config to define the default environment */
-#ifndef __ASSEMBLY__
-#define __ASSEMBLY__ /* get only #defines from config.h */
-#include <config.h>
-#undef	__ASSEMBLY__
-#else
-#include <config.h>
-#endif
 
 /*
  * To build the utility with the static configuration