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This lets the Chrome WebRTC audio processors analyze playout audio of
more than two channels, since they have switched to use the
webrtc::AudioProcessing StreamConfig APIs.

Bug: chromium:982276, chromium:1016708
Change-Id: I054b3c50a58537d2c684181e9298fdf4302336e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903347Reviewed-by: Olga Sharonova <olka@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Sam Zackrisson <saza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714217}