Fixed tests that were not properly mocking PackageManager.

Test: atest DeviceAdminAddHeaderPreferenceControllerTest DeviceAdminAddSupportPreferenceControllerTest DeviceAdminAddWarningPreferenceControllerTest EnterpriseUtilsTest CarSettingsUnitTests:com.android.car.settings.enterprise.WorkPolicyInfoPreferenceControllerTest

Fixes: 192100862

Change-Id: Icc120c8e73c2591203c4ddefd227224f98f50b4c
6 files changed