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This CL deploys the usage of platform side of attestation flow because
attestation service at platform side knows better about the stat
machines of the enrollment.

BUG=b:158955123

Change-Id: I902f8bfc43da9cb2cae0e65a0d244c31ce986dfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2297061
Commit-Queue: Leo Lai <cylai@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789858}