Ensure a user's SP does't change.

Changes of the SP are caused by untrusted credential reset which can be
triggered by certain admin modes. When such an admin is active, the SP
needs to be cached. Untrusted reset will be removed in a future release
at which point this caching can also be removed.

Bug: 71527305
Test: runtest frameworks-services -p com.android.server.locksettings
Test: cts-tradefed run cts-dev -m CtsDevicePolicyManagerTestCases -t com.android.cts.devicepolicy
Change-Id: I54f3b299b79ce019ba679b5550d37fd090b679fb