sdbusplus: replace message::variant with std::variant

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ifc7c680ca196882d890d8b7061fe56428285c276
diff --git a/src/processing.hpp b/src/processing.hpp
index 75a4350..114b502 100644
--- a/src/processing.hpp
+++ b/src/processing.hpp
@@ -25,9 +25,8 @@
  * pair2: D-bus Method,vector[Associations]
  */
 using InterfacesAdded = std::vector<std::pair<
-    std::string,
-    std::vector<std::pair<
-        std::string, sdbusplus::message::variant<std::vector<Association>>>>>>;
+    std::string, std::vector<std::pair<
+                     std::string, std::variant<std::vector<Association>>>>>>;
 
 /** @brief Get well known name of input unique name
  *