Allowlist provision for retail demo even `device_admin` is disabled

Enable provisioning API for retail demo mode even the device_admin and managed_users features are disabled.

Bug: 419238296, 422879516
Test: atest android.devicepolicy.cts.DevicePolicyManagerTest and manual test with device_admin disabled on device
Flag: android.app.admin.flags.remove_device_admin_feature_checks
Change-Id: I7a924510cf61fdea9681076bf4c14ac03f8223b1