clang-tidy: Enable readability-redundant-access-specifiers check

Finds classes, structs, and unions containing redundant member
(field and method) access specifiers.

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I6ce8c84fbab98de5efd6a11804f9dc58afae5027
diff --git a/.clang-tidy b/.clang-tidy
index c3291cd..c10e753 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -264,6 +264,7 @@
 readability-misplaced-array-index,
 readability-named-parameter,
 readability-non-const-parameter,
+readability-redundant-access-specifiers,
 readability-redundant-function-ptr-dereference,
 readability-redundant-preprocessor,
 readability-redundant-smartptr-get,
diff --git a/manager/json-config.hpp b/manager/json-config.hpp
index d02af56..b4a4efa 100644
--- a/manager/json-config.hpp
+++ b/manager/json-config.hpp
@@ -202,7 +202,6 @@
         return;
     }
 
-  private:
     /**
      * @brief sd event handler.
      */