Adopt the new naming convention, which replaces "analog gain" and "mic level" with "input volume", in the input volume stats reporter. Bug: webrtc:7494 Change-Id: Ia24876151f51dd1dcc4e4f9db56c64d11ae3b442 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/279840 Reviewed-by: Hanna Silen <silen@webrtc.org> Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38467}