Update `AudioProcessing::Config::ToString()` to also dump the config from `AnalogGainController` which is missing. Bug: webrtc:7494 Change-Id: Iea5dab1f6abb9ec8581ce690a2a119f202b4d1e1 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/219082 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Cr-Commit-Position: refs/heads/master@{#34025}