Rename constants and arguments reflecting the old naming with RMS error overriding the error calculated by the analog AGC. Rename the related unit tests and helper functions. Bug: webrtc:7494 Change-Id: I9a1d972e9ff7ab5cdd43ca3568379d511801adee Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/280481 Reviewed-by: Alessio Bazzica <alessiob@webrtc.org> Commit-Queue: Hanna Silen <silen@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38552}