APM: speaker_cleanup is not a beacon usecase

Do not prevent AUDIO_USAGE_SPEAKER_CLEANUP playback when
other streams are playing, or when the beacon output is
not available.

Flag: android.media.audio.speaker_cleanup_usage
Bug: 355050846
Test: atest CtsMediaAudioTestCases:udioAttributesTest

Change-Id: I4c6b0c824e30eb0d0df9de7114b99d13ea99def4