gooftool: Add verify_tpm to check tpm is cleared.

BUG=chrome-os-partner:20266
TEST=run gooftool verify_tpm

Change-Id: Ia89750bc05a1c19a80938151170b178650946aae
Reviewed-on: https://gerrit.chromium.org/gerrit/58982
Reviewed-by: Vic Yang <victoryang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Commit-Queue: Cheng-Yi Chiang <cychiang@chromium.org>
diff --git a/py/gooftool/gooftool.py b/py/gooftool/gooftool.py
index 5c5637d..60694e3 100755
--- a/py/gooftool/gooftool.py
+++ b/py/gooftool/gooftool.py
@@ -501,6 +501,11 @@
 
   return GetGooftool(options).VerifyRootFs()
 
+@Command('verify_tpm')
+def VerifyTPM(options):  # pylint: disable=W0613
+  """Verify TPM is cleared."""
+
+  return GetGooftool(options).VerifyTPM()
 
 @Command('verify_switch_wp')
 def VerifyWPSwitch(options):  # pylint: disable=W0613
@@ -625,6 +630,7 @@
   VerifySystemTime(options)
   VerifyKeys(options)
   VerifyRootFs(options)
+  VerifyTPM(options)
 
 
 @Command('log_system_details')