Call TrustManager#reportUserRequestedUnlock

Instead of posting a notification (which was only used for testing).
Now, SystemUI is hooked up to TrustManager.

Also, removes ActiveUnlock feature flag.

Test: atest SystemUITests
Bug: 192405661
Fixes: 213631396
Change-Id: I0afc9a9bcb482148fbb0d164d20c00b715e28f80
4 files changed