Add new APIs setAutoTimeZone and getAutoTimeZone

* Added new API methods setAutoTimeZone and getAutoTimeZone.
* DPCs are recommended to combine these new APIs together with the DISALLOW_CONFIG_DATE_TIME
  restriction to prevent the user from changing auto time zone 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 zone toggle
      atest com.android.server.devicepolicy.DevicePolicyManagerTest
      atest com.android.cts.devicepolicy.MixedProfileOwnerTest#testSetAutoTimeZone
      atest com.android.cts.devicepolicy.ManagedProfileTest#testParentProfileApiDisabled

Change-Id: I841d31f76a848e9679d2d9087426e1d5bb7efd1d
diff --git a/core/proto/android/stats/devicepolicy/device_policy_enums.proto b/core/proto/android/stats/devicepolicy/device_policy_enums.proto
index f8c304c..ee5144c 100644
--- a/core/proto/android/stats/devicepolicy/device_policy_enums.proto
+++ b/core/proto/android/stats/devicepolicy/device_policy_enums.proto
@@ -152,4 +152,5 @@
   CROSS_PROFILE_APPS_GET_TARGET_USER_PROFILES = 125;
   CROSS_PROFILE_APPS_START_ACTIVITY_AS_USER = 126;
   SET_AUTO_TIME = 127;
+  SET_AUTO_TIME_ZONE = 128;
 }