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

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I96011a7be0c4577617fdbfcd95ffbc5a3177be49
diff --git a/phosphor-power-supply/psu_manager.cpp b/phosphor-power-supply/psu_manager.cpp
index 9880b08..f31ba73 100644
--- a/phosphor-power-supply/psu_manager.cpp
+++ b/phosphor-power-supply/psu_manager.cpp
@@ -114,7 +114,7 @@
 {
     int32_t state = 0;
     std::string msgSensor;
-    std::map<std::string, sdbusplus::message::variant<int32_t>> msgData;
+    std::map<std::string, std::variant<int32_t>> msgData;
     msg.read(msgSensor, msgData);
 
     // Check if it was the Present property that changed.