Merge "Use a RwLock for DB_PATH" am: 8a9352625f am: 6bb76bbaa2 am: 5741c15899

Original change: https://android-review.googlesource.com/c/platform/system/security/+/1703805

Change-Id: Id5f0fd8c8661f5f2703c9a8ce6ec410528c5a8f9