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

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I18f79cafeb469f1b3dd56d6a05f3aa919269ddf9
diff --git a/system_configuration.cpp b/system_configuration.cpp
index be5fc91..c2d448c 100644
--- a/system_configuration.cpp
+++ b/system_configuration.cpp
@@ -68,7 +68,7 @@
 
 std::string SystemConfiguration::getHostNameFromSystem() const
 {
-    sdbusplus::message::variant<std::string> name;
+    std::variant<std::string> name;
     auto method = bus.new_method_call(HOSTNAMED_SERVICE, HOSTNAMED_SERVICE_PATH,
                                       PROPERTY_INTERFACE, METHOD_GET);