Update message shown for unattended update

Fixes: 293477849
Test: verified manually,
  1. Enable the feature flag
  2. Unlock the device
  3. Run `adb shell cmd recovery request-lskf ota`
  4. Suspend the device and go to the bouncer
  5. New message should be shown
Change-Id: I1fe0718de43769424dd7eeff65faec935caea89d