Implements profile selection tab in Storage Settings

- StorageDashboardFragment and StorageItemPreferenceController works only
  for one profile per instance.
- StorageAsyncLoader loads for all users(profiles) and regards each user independent.
- SecondaryUserController will not load personal profile user in work profile tab.
- Cleanup some unused profile related files.

Bug: 174964885
Test: atest com.android.settings.deviceinfo
      atest com.android.settings.deviceinfo.storage
      make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.deviceinfo
      make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.deviceinfo.storage
Change-Id: I8361c29bc240c519c7261b19522c41439479c1c2

tests/robotests/assets/exempt_not_implementing_index_provider

@@ -36,9 +36,7 @@ com.android.settings.datausage.DataUsageList
 com.android.settings.datausage.DataUsageSummary
 com.android.settings.datetime.timezone.TimeZoneSettings
 com.android.settings.development.compat.PlatformCompatDashboard
-com.android.settings.deviceinfo.PrivateVolumeSettings
 com.android.settings.deviceinfo.PublicVolumeSettings
-com.android.settings.deviceinfo.StorageProfileFragment
 com.android.settings.deviceinfo.legal.ModuleLicensesDashboard
 com.android.settings.enterprise.ApplicationListFragment$AdminGrantedPermissionCamera
 com.android.settings.enterprise.ApplicationListFragment$AdminGrantedPermissionLocation