Add DISALLOW_CONFIG_DATE_TIME user restriction.

Test: cts test for bug 67627542 in following cl
Bug: 67497909

Follow design doc: https://docs.google.com/document/d/1NV93mr2CT157S_haru1QbKo9HLeP9iPM9eMiGfVmfCM/edit#
Change-Id: Iee3c2fbf88b4958dde81330c2e4d60dfce09197f