Rearrange vboot_reference directories to isolate external components.

src/platform/vboot_reference/vboot_firmware/stub/utility_stub.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Stub implementations of utility functions which call their linux-specific
  * equivalents.
  */
 
 #include "utility.h"
 
@@ skipping 78 matching lines @@
     return NULL;
   if (len > state->remaining_len) {
     state->overrun = 1;
     return NULL;
   }
   Memcpy(state->remaining_buf, src, len);
   state->remaining_buf += len;
   state->remaining_len -= len;
   return src;
 }