AudioFlinger: fix fast capture silence
Silencing fast catpure tracks was not properly implemented. Fix by zeroing fast capture thread HAL read buffer if the silenced track is the only active, or by invalidating the silenced track if other non fast tracks are active. Bug: 157708122 Test: repro steps in the bug Change-Id: I88b19540815bc1491b9e76c1ae6b6f85e32afa8f
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