Compress .so files for PackageManager to reclaim the space

Let's set compression bit to compress .so files in first place for PM.
If the underlying filesystem like f2fs supports per-file compression, we can
give the compressed space back to user.

Bug: 188859114
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
Change-Id: I6f261946c0a076ec50ec41bfe031f4438fed4db8