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Edge cases have been discovered where the TPM firmware update
completes successfully after interruption, but leaves the TPM in a
state where the SRK is still vulnerable. This adds support for a new
"cleanup" mode that is available when the system flags a vulnerable
SRK on an updated system.

BUG=chromium:872746
TEST=Extended existing unit tests.

Change-Id: I4fd5dab72961d9cac4b985b688ebff6740317111
Reviewed-on: https://chromium-review.googlesource.com/1172685
Commit-Queue: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583207}