env: Drop saveenv() in favour of env_save()

Use the env_save() function directly now that there is only one
implementation of saveenv().

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Denk <wd@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/include/environment.h b/include/environment.h
index b4f9366..a055e3f 100644
--- a/include/environment.h
+++ b/include/environment.h
@@ -325,6 +325,13 @@
  */
 int env_load(void);
 
+/**
+ * env_save() - Save the environment to storage
+ *
+ * @return 0 if OK, -ve on error
+ */
+int env_save(void);
+
 #endif /* DO_DEPS_ONLY */
 
 #endif /* _ENVIRONMENT_H_ */