Return new authenticatorId when invalidation finishes

The new authenticatorId will always be needed by the client after
invalidation finishes. This change allows the client to receive it
without requesting getAuthenticatorId.

Test: m android.hardware.biometrics.face-update-api
Test: m android.hardware.biometrics.fingerprint-update-api
Test: m VtsHalBiometricsFaceTargetTest
Test: m VtsHalBiometricsFingerprintTargetTest

Bug: 159667191
Change-Id: I63166315789945966ff8081e07dd714cc14bc2f0