tools: implement 'nfdc cs erase' command

refs #4318

Change-Id: If4dc401a3efff44a5bf4b3074d21797f8384cf9f
diff --git a/tools/nfdc/cs-module.hpp b/tools/nfdc/cs-module.hpp
index 4181290..3b16952 100644
--- a/tools/nfdc/cs-module.hpp
+++ b/tools/nfdc/cs-module.hpp
@@ -51,6 +51,11 @@
   static void
   config(ExecuteContext& ctx);
 
+  /** \brief the 'cs erase' command
+   */
+  static void
+  erase(ExecuteContext& ctx);
+
   void
   fetchStatus(Controller& controller,
               const std::function<void()>& onSuccess,