Implementing lockUser

Allow TrustAgents to request that TrustManagerService lock the user and
revoke trust and trustable status. This can be used to provide user
facing controls to lock the phone from a connected wearable.

Bug: 213631677
Test: prototype

Change-Id: I719584cce5d5c57d2c41de9f7c26ce9609a981f9
4 files changed