[Mainline] Removed non-formal API getAllSubscriptionInfoList to used in Settings

Bug: 147206736
Test: make RunSettingsRoboTests ROBOTEST_FILTER=DataUsageSummaryPreferenceControllerTest
      make RunSettingsRoboTests ROBOTEST_FILTER=DataUsageUtilsTest
      make RunSettingsRoboTests ROBOTEST_FILTER=SettingsDumpServiceTest
Change-Id: Ie9c01afa2b128f8d296b160d3628ea1fb7176e59
3 files changed