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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/+/1715474Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Anurag Agrawal <anuragagrawal@google.com>
Cr-Commit-Position: refs/heads/master@{#684188}