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

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: If20545ad78b4b813e7bba0909c99fa7156a00c96
diff --git a/phosphor-ldap-config/ldap_config.cpp b/phosphor-ldap-config/ldap_config.cpp
index 913dae3..ab63792 100644
--- a/phosphor-ldap-config/ldap_config.cpp
+++ b/phosphor-ldap-config/ldap_config.cpp
@@ -160,7 +160,7 @@
 void Config::certificateChanged(sdbusplus::message::message& msg)
 {
     std::string objectName;
-    std::map<std::string, sdbusplus::message::variant<std::string>> msgData;
+    std::map<std::string, std::variant<std::string>> msgData;
     msg.read(objectName, msgData);
     auto valPropMap = msgData.find(certProperty);
     {