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Mark 'session' field in audio HAL AIDL as unused.
The 'session' field is only used by the framework (if at all), so it being moved to the HAL AIDL to the system-specific part. Also update the comment on AudioPort. Bug: 205884982 Test: m Change-Id: Ia214c343bbf08c7944ea5ebf6140a92821941b46