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

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I664c4982aa03664728d7375d78dfae6e595c2d20
diff --git a/utility.hpp b/utility.hpp
index 26968ec..13c6e36 100644
--- a/utility.hpp
+++ b/utility.hpp
@@ -46,7 +46,7 @@
                  const std::string& path, const std::string& service,
                  sdbusplus::bus::bus& bus, T& value)
 {
-    sdbusplus::message::variant<T> property;
+    std::variant<T> property;
 
     auto method = bus.new_method_call(service.c_str(), path.c_str(),
                                       PROPERTY_INTF, "Get");
@@ -74,7 +74,7 @@
                  const std::string& path, const std::string& service,
                  sdbusplus::bus::bus& bus, T& value)
 {
-    sdbusplus::message::variant<T> propertyValue(value);
+    std::variant<T> propertyValue(value);
 
     auto method = bus.new_method_call(service.c_str(), path.c_str(),
                                       PROPERTY_INTF, "Set");