logcatd: fallocate and fadvise to logcat files
1. Pinning and fallocating blocks can avoid filesystem fragmentation.
2. Dropping caches can avoid memory pressure.
3. Use 2MB files
Bug: 136483670
Bug: 137180754
Change-Id: I0827bd903a677cbcbf3688983e847301cd541cdd
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
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