Fix/suppress statsd google-explicit-constructor warnings

* Add explicit to conversion constructors/operators
* Remove redundant explicit of copy constructors

Bug: 28341362
Test: make with WITH_TIDY=1 DEFAULT_GLOBAL_TIDY_CHECKS=-*,google-explicit-constructor
Change-Id: Ifd0ca9a1afe4a2cb0456a36c69bee1633af5a93a
diff --git a/cmds/statsd/src/logd/LogEvent.h b/cmds/statsd/src/logd/LogEvent.h
index 24d624d..8a03ac4 100644
--- a/cmds/statsd/src/logd/LogEvent.h
+++ b/cmds/statsd/src/logd/LogEvent.h
@@ -158,7 +158,7 @@
      * Don't copy, it's slower. If we really need this we can add it but let's try to
      * avoid it.
      */
-    explicit LogEvent(const LogEvent&);
+    LogEvent(const LogEvent&);
 
     /**
      * Parses a log_msg into a LogEvent object.