Add Keyguard bottom area string for adaptive auth

Flag: ACONFIG android.adaptiveauth.enable_adaptive_auth DEVELOPMENT
Bug: 285053096
Test: 1. Trigger 5 failed biometric attempts and/or primary auth
         attempts from BiometricPrompt or Settings (not on Keyguard),
         which will lock the device out
      2. See message in the Keyguard bottom area
Change-Id: Iec5752e38661eb0a51b30151d36fe8a357207eae