VBoot Reference: Add kernel rollback prevention and choosing logic.

src/platform/vboot_reference/tests/rollback_index_mock.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.
  *
  * Mock rollback index library for testing.
  */
 
 #include "rollback_index.h"
 
 #include <stdio.h>
 #include <stdint.h>
 
 uint16_t g_firmware_key_version = 0;
 uint16_t g_firmware_version = 0;
 uint16_t g_kernel_key_version = 0;
 uint16_t g_kernel_version = 0;
 
 void SetupTPM(void) {
+#ifndef NDEBUG
   fprintf(stderr, "Rollback Index Library Mock: TPM initialized.\n");
+#endif
 }
 
 uint16_t GetStoredVersion(int type) {
   switch (type) {
     case FIRMWARE_KEY_VERSION:
       return g_firmware_key_version;
       break;
     case FIRMWARE_VERSION:
       return g_firmware_version;
       break;
@@ skipping 15 matching lines @@
     case FIRMWARE_VERSION:
       g_firmware_version = version;
       break;
     case KERNEL_KEY_VERSION:
       g_kernel_key_version = version;
       break;
     case KERNEL_VERSION:
       g_kernel_version = version;
       break;
   }
+#ifndef NDEBUG
   fprintf(stderr, "Rollback Index Library Mock: Stored Version written.\n");
+#endif
   return 1;
 }
 
 void LockStoredVersion(int type) {
+#ifndef NDEBUG
   fprintf(stderr, "Rollback Index Library Mock: Version Locked.\n");
+#endif
 }