Replace setAutoTimeRequired and getAutoTimeRequired with setAutoTime and getAutoTime

* Deprecate setAutoTimeRequired and getAutoTimeRequired.
* Added new API methods setAutoTime and getAutoTime.
* DPCs are recommended to combine these new APIs together with the DISALLOW_CONFIG_DATE_TIME
  restriction to prevent the user from changing auto time settings.
* The new methods can also be called by the WP PO (COPE mode).

Bug: 138709470
Test: Manual testing with testdpc and the set auto time toggle
      atest com.android.server.devicepolicy.DevicePolicyManagerTest
      atest com.android.cts.devicepolicy.MixedProfileOwnerTest#testSetAutoTime

Change-Id: I6f93b2a28e3ef0e1e97c9c414ce65d4e753c1bf3