Replace the use of speech level target and digital gain maximum with speech level target range parameters. Bug: webrtc:7494 Change-Id: I703756c5a3fbd330ed585e3f5b4ac3141d9ea6e2 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/280943 Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Reviewed-by: Alessio Bazzica <alessiob@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38563}