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This CL add the necessary boilerplate to dynamically load the AAudio
library, along with an output audio stream implementation built on top
of AAudio.

Change-Id: If07039e278ea8aadace44a03e2c2035073047f03
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1814543
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699094}