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Set up a CertStoreBridge between arc-keymasterd and chrome to
allow arc-keymasterd to use the keys accessible by chrome.

Add SecurityTokenOperationBridge that implements SecurityTokenOperation and
performs the signature of pre-hashed digest using security token certificates.

Bug: b:119914122
Test: ./unit_tests --gtest_filter=SecurityTokenOperationBridgeTest*
Test: local device
Change-Id: I791ab28ab639b85652ae4ccaf0b3d4f8fb37ae83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1852447Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Edman Anjos <edman@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Polina Bondarenko <pbond@chromium.org>
Auto-Submit: Polina Bondarenko <pbond@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729672}