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This ports similar (internal) code used on systems not supporting CMA backend.

Bug: internal b/77986368
Test: Running on speakers, observing proper logs.
Change-Id: Ifde45f035e2f52096f82e9682bf5c60b170d2c47
Reviewed-on: https://chromium-review.googlesource.com/1014740Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Chris Kuiper <ckuiper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551488}