Add RestrictedSwitchPreference.ifBlockedByAdminOverrideCheckedValueTo

Some switch need this use case, when this is set on an switch UI,
the switch's checked status will be overridden to this value.

Bug: 380205192
Flag: EXEMPT bug fix
Test: manual - on Install unknown apps
Test: atest RestrictedSwitchPreferenceTest
Test: atest TogglePermissionAppListPageTest
Change-Id: Ib88ea74c61e175bb7d82b6b4f5e49ca9ea158471