Revert "DO NOT MERGE. Revert "Enable the TimeZoneManagerService""

This reinstates the selinux changes for the timezone service that
were reverted on oc-dr1-dev and undesirably merged down to master.

This reverts commit 96c619c8.

Test: make
Bug: 31008728
Change-Id: Ief2129c409de09b2782881a6556d918af59badd9