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This change fixes a bug that prevented FakeCryptohomeClient from
answering on TpmAttestationGetPublicKey request and adds a helper
function to configure its result.

Bug: 1045895
Change-Id: I4f7a72c2768f78df97c43756932ca7700a62b999
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050277Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Commit-Queue: Michael Ershov <miersh@google.com>
Cr-Commit-Position: refs/heads/master@{#740599}