Rearrange vboot_reference directories to isolate external components.

src/platform/vboot_reference/vboot_firmware/lib/kernel_image_fw.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.
  *
  * Functions for verifying a verified boot kernel image.
  * (Firmware portion)
  */
 
 #include "kernel_image_fw.h"
 
@@ skipping 415 matching lines @@
   /* Lock Kernel TPM rollback indices from further writes.
    * TODO(gauravsh): Figure out if these can be combined into one
    * 32-bit location since we seem to always use them together. This can help
    * us minimize the number of NVRAM writes/locks (which are limited over flash
    * memory lifetimes.
    */
   LockStoredVersion(KERNEL_KEY_VERSION);
   LockStoredVersion(KERNEL_VERSION);
   return kernel_to_boot;
 }