Revert^2 "Read from BufferReleaseChannel in background thread"

This reverts commit 8af62f245bfc575a00f08db450067d172ef7c825.

Reason for revert: The feature flag was enabled when this change was merged. I've disabled the feature flag so this change shouldn't cause issues. I'll add the missing SELinux permissions in AOSP.

Change-Id: I9b07a854b0e0514d8036066f7b05a37a9701991b
7 files changed