The device id (aka client id) seems to come down from DM server during enrollment.  From what I can see, it's only used in enterprise platform keys private API EPKPChallengeKeyBase::GetDeviceId().

After discussion with David: Let's keep it for now, maybe re-discuss for M-58.  (I'm still not 100% sure what it's needed for, but attestation seems to be one use case.)

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I thinkg it's obsolete