Use VbSharedData instead of VbNvStorage for fwb_tries and kernkey_vfy

firmware/lib/vboot_kernel.c

 /* Copyright (c) 2011 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 loading a kernel from disk.
  * (Firmware portion)
  */
 
 #include "vboot_kernel.h"
 
@@ skipping 633 matching lines @@
                               : VBSD_LKC_CHECK_NO_PARTITIONS);
 
     /* TODO: differentiate between finding an invalid kernel
      * (found_partitions>0) and not finding one at all.  Right now we
      * treat them the same, and return LOAD_KERNEL_INVALID for both. */
     retval = LOAD_KERNEL_INVALID;
   }
 
 LoadKernelExit:
 
-  /* Save whether the good partition's key block was fully verified */
-  VbNvSet(vnc, VBNV_FW_VERIFIED_KERNEL_KEY, good_partition_key_block_valid);
-
   /* Store recovery request, if any, then tear down non-volatile storage */
   VbNvSet(vnc, VBNV_RECOVERY_REQUEST, LOAD_KERNEL_RECOVERY == retval ?
           recovery : VBNV_RECOVERY_NOT_REQUESTED);
   VbNvTeardown(vnc);
 
   if (shared) {
     if (shcall)
       shcall->return_code = (uint8_t)retval;
 
     /* Save whether the good partition's key block was fully verified */
     if (good_partition_key_block_valid)
       shared->flags |= VBSD_KERNEL_KEY_VERIFIED;
 
     /* Save timer values */
     shared->timer_load_kernel_enter = timer_enter;
     shared->timer_load_kernel_exit = VbGetTimer();
     /* Store how much shared data we used, if any */
     params->shared_data_size = shared->data_used;
   }
 
   return retval;
 }