[DO NOT MERGE] Handling power press messages sent from the HAL

Test: Manually checked behavior when power is pressed for:
Biometric Prompt: an error is shown
Keyguard authentication: nothing happens
Fingerprint Enrollment: an acquired message is displayed
atest FingerprintAuthenticationClientTest FingerprintEnrollClientTest
Bug: 265202141

Change-Id: I842115fae9f25387c7d8d5b494336b3fe10c2cb0
Merged-in: I842115fae9f25387c7d8d5b494336b3fe10c2cb0