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
diff --git a/logd/LogStatistics.h b/logd/LogStatistics.h
index 28810d9..8558b06 100644
--- a/logd/LogStatistics.h
+++ b/logd/LogStatistics.h
@@ -397,6 +397,9 @@
     typedef LogHashtable<uint32_t, TagEntry> tagTable_t;
     tagTable_t tagTable;
 
+    // security tag list
+    tagTable_t securityTagTable;
+
 public:
     LogStatistics();