Check whether the user is a sub profile before starting Settings homepage

Fix: 336449492
Test: atest SettingsHomepageActivityTest LocationInjectedServicesPreferenceControllerTest UserDetailsSettingsTest ActionDisabledByAdminDialogHelperTest ProfileSelectFragmentTest ProfileSelectLocationFragmentTest
- Start a managed app's info page
- Start a private app's info page
- Switch to a secondary user and start Settings
- Switch to the guest user and start Settings

Change-Id: I1c7c95d95c4739d70839a742ebc4e72b59b1d555