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The buffer passed to CmaBackend::PushBuffer may be stored in the backend
decoder for some time before actual playout.  It should not be modified
since it could corrupt audio that is yet to play out.

Bug: b/124402185, b/126295803
Test: Tested multizone on Android
Change-Id: Ie31d3b8f9d831597e00f2f5b72b3e2694b38406b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1603762
Commit-Queue: Alex Leung <alexleung@google.com>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658303}