Add NV storage fields for firmware flags

firmware/include/vboot_nvstorage.h

Index: firmware/include/vboot_nvstorage.h
diff --git a/firmware/include/vboot_nvstorage.h b/firmware/include/vboot_nvstorage.h
index 31bc539ed9be6d9e1ad43b3fde232a3516cff763..4b92e7f8708be1879c97260bd1138c261dc87a77 100644
--- a/firmware/include/vboot_nvstorage.h
+++ b/firmware/include/vboot_nvstorage.h
@@ -47,6 +47,13 @@ typedef enum VbNvParam {
   VBNV_LOCALIZATION_INDEX,
   /* Field reserved for kernel/user-mode use; 32-bit value. */
   VBNV_KERNEL_FIELD,
+  /* Firmware checked RW slot B before slot A on the current boot because
+   * VBNV_TRY_B_COUNT was non-zero at that time.  0=no; 1=yes. */
+  VBNV_FW_USED_TRY_B,
+  /* Firmware verified the kernel key block signature using the key stored
+   * in the firmware.  0=no, just used the key block hash; 1=yes, used the
+   * key block signature. */
+  VBNV_FW_VERIFIED_KERNEL_KEY,
 } VbNvParam;