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

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I927996a9ce14cfb6251c6d7a1d8be081d9369174
diff --git a/elog_watch.cpp b/elog_watch.cpp
index 6abc02b..7144281 100644
--- a/elog_watch.cpp
+++ b/elog_watch.cpp
@@ -25,7 +25,7 @@
 using namespace phosphor::logging;
 constexpr auto LOG_PATH = "/xyz/openbmc_project/logging";
 using Message = std::string;
-using Attributes = sdbusplus::message::variant<Message>;
+using Attributes = std::variant<Message>;
 using AttributeName = std::string;
 using AttributeMap = std::map<AttributeName, Attributes>;
 using PropertyName = std::string;