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Revert "Use non-blocking mode for CMA backend audio code: initial implementation"

This reverts commit 45143094.

Reason for revert: breaks cast_media_unittests multizone tests on android (Multi
zoneBackendTest.RenderingDelay/*)

Bug: b/140341448

Original change's description:
> Use non-blocking mode for CMA backend audio code: initial implementation
>
> Bug: http://b/111500583
>
> [Audio] Use NON_BLOCKING mode in CMA backend audio code.
>
> Ref: b/110722296
> Change-Id: I04879e148e832c795fe2066143d8ef4e29ec5315
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715474
> Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
> Commit-Queue: Anurag Agrawal <anuragagrawal@google.com>
> Cr-Commit-Position: refs/heads/master@{#684188}

TBR=kmackay@chromium.org,brettk@google.com,anuragagrawal@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: http://b/111500583
Change-Id: I2e32fc4db3512241f3dcc113c2d4d57f2b2eb4dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779619Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692374}