This CL adds a smooth rampup of the NLP gain in AEC3.
Bug: webrtc:8361
Change-Id: I49aa75904751ffe9150db1572271fe7a26232449
Reviewed-on: https://webrtc-review.googlesource.com/7740
Commit-Queue: Per Åhgren <peah@webrtc.org>
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20213}