Fix/suppress incident* 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: I26a11bb798d25605577269ed340e97afc8566960
diff --git a/cmds/incidentd/src/Privacy.h b/cmds/incidentd/src/Privacy.h
index a3df490..a0159d9 100644
--- a/cmds/incidentd/src/Privacy.h
+++ b/cmds/incidentd/src/Privacy.h
@@ -83,7 +83,7 @@
     static PrivacySpec new_spec(int dest);
 
 private:
-    PrivacySpec(uint8_t dest) : dest(dest) {}
+    explicit PrivacySpec(uint8_t dest) : dest(dest) {}
 };
 
 }  // namespace incidentd