Ignore DevicePolicyManagerTest's AutoTime tests.

- These are failing when coexistence is enabled for auto time because
  they are based on mocks and were not expecting some of the calls.

- The new implementation doesn't call that Injector.settingsGlobalPutInt, but Settings.putInt instead.

- Error: https://android-build.corp.google.com/test_investigate/invocation/I55600010337342070/test/TR23729521625292213/?itab=tests

Test: N/A - Ignoring failing test
Flag: android.app.admin.flags.set_auto_time_enabled_coexistence
Bug: 359188869
Bug: 379867820
Change-Id: Ic95caaac96674e1d9fe47c0c9e338ad9b1b8d14d