TimeServiceHelper changes to assist in next steps

For upcoming changes it makes more sense for the time-related
state to be accessible from TimeServiceHelper rather than
NitzStateMachine.DeviceState so these have moved.

Bug: 63743683
Test: atest FrameworksTelephonyTests
Change-Id: I9580140f730f3bce203069df7db9b390de799af3
Merged-In: I9580140f730f3bce203069df7db9b390de799af3
(cherry picked from commit 7cecf024)