Finish unlocking user before touching apps.

Direct Boot unaware apps can end up calling back into the system,
racing with us pushing the user into the UNLOCKED state.  So make
sure we get the user actually UNLOCKED before telling apps that
we're unlocked.

Test: builds, boots
Bug: 73606555
Change-Id: I1501283f80a84d850364a5fc0e119893726618fa