Use network time when calculate next checkin timestamp

The response from server should be based on network time.

Test: atest DeviceLockControllerRoboTests
Bug: 288937639

Change-Id: Ie181666c32994e139f6b51d8694223499c41b20b
(cherry picked from commit c59b1014485d24c19bebc32bb903ef4d4505bb3d)
1 file changed