nvramcui: Remove unnecessary header files

Change-Id: If845729bc34df646a5628ac2a35acc737fd4701d
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14483
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

payloads/nvramcui/nvramcui.c

@@ -13,9 +13,6 @@
  * GNU General Public License for more details.
  */
 
-#include <stdlib.h>
-#include <string.h>
-
 #include <libpayload.h>
 #include <coreboot_tables.h>