On native audioserver recovery the assistant UIDs will reset to an empty
list, followed by adding the current role or setting holder for
assistant. Also added a settings lock around the update assistant
method. Added remove assistant UID for reset hotword detection
connection.
Bug: 222584963
Bug: 222777782
Test: atest VoiceInteractionTest
Test: atest AudioManagerTest
Test: atest HotwordDetectionServiceBasicTest
Test: kill audio server and verify assistant UIDs is not increasing
unbounded.
Test: adb shell cmd voiceinteraction restart-detection, verify assistant
UIDs list is not increasing unbounded.
Change-Id: I475bfee1f0bcd56a750e4fef8aa8a2b93fe090fc
3ae3376064