Update logic to set legacy remote submix rrid.

1. Only record legacy remote submix information when the recording event
is START or UPDATE.
2. The AudioDeviceInfo returned from AudioRecordingConfiguration may be
null. Check if the audio device info is null or not to avoid NPE.

Test: make
Test: volume adjustable on chromecast mirror mode when enabling LC
Bug: 152796386
Change-Id: Ibf9d5dd0d8a59339ca9c0c7547b84d033ed9bfd0
1 file changed