Refactored some com.android.car.settings.enterprise interfaces.

They're now using a Context and Object instead of Activity and
AlertDialog.Builder, as the CarSettings implemention doesn't use
the latter.

Bug: 184107103
Bug: 188836559

Test: atest RunSettingsLibRoboTests:com.android.settingslib.enterprise.FinancedDeviceActionDisabledByAdminControllerTest && \
      atest RunSettingsLibRoboTests:com.android.settingslib.enterprise.ManagedDeviceActionDisabledByAdminControllerTest

Change-Id: Ifb08692f8b1973b8ffaeb98b29101b6a8f642922
5 files changed