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This CL adds part of the rnnoise library in 3rd party.
What is retained are pretrained parameters and a few
functions implementing a recurrent neural network.

Change-Id: I66c55958d13b7f120aa508f6d7afd7f13f59f659
Reviewed-on: https://chromium-review.googlesource.com/931553Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Ale Bzk <alessiob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539174}