logd: liblog: logcat: Add LOG_ID_SECURITY

- Largish commit, buffer and access controls done together
- Add LOG_ID_SECURITY binary content log
- Add "default" meta buffer
- allow LOG_ID_SECURITY only from AID_SYSTEM and AID_ROOT UID & GID
- Use __android_log_security() to gate logging
- Add __android_log_security_bwrite() native access to security
  logging.
- Add liblog.__security_buffer end-to-end gTest

Bug: 26029733
Change-Id: Ibcf5b4660c17c1aa6902c0d93f8ffd29c93d9a93
14 files changed
tree: 0567d54929a0278b98b60d9296201f6911e8c289
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/