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Switch to explicit channel mappings (RFC 7845) when creating multi-stream Opus en/de-coders. The responsibility of setting up the channel mappings will shift from WebRTC to the WebRTC user. See https://webrtc-review.googlesource.com/c/src/+/121764 for the current vision. See also the first child CL https://webrtc-review.googlesource.com/c/src/+/129768 that sets up the Decoder to use this code. Bug: webrtc:8649 Change-Id: I55959a293d54bb4c982eff68ec107c5ef8666c5c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/129767 Commit-Queue: Alex Loiko <aleloi@webrtc.org> Reviewed-by: Oskar Sundbom <ossu@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27452}