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As part of easy sign-in protocol, a nonce has to be signed by TPM
private key. To be able to do this, we need to allow system token to be
loaded before a user is logged in. This cl starts system token
initialization (which is done by TPMTokenLoader) before LoginState is
LOGGED_IN if there is a user with easy sign-in enabled.

BUG=409027

Review URL: https://codereview.chromium.org/741593002

Cr-Commit-Position: refs/heads/master@{#308321}