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

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I46bdb828379d72e16a95fe1bc3cb578bfdfce80c
diff --git a/occ_finder.cpp b/occ_finder.cpp
index c6926fd..3279632 100644
--- a/occ_finder.cpp
+++ b/occ_finder.cpp
@@ -47,7 +47,7 @@
         elog<InternalFailure>();
     }
 
-    sdbusplus::message::variant<T> value;
+    std::variant<T> value;
     reply.read(value);
 
     return std::get<T>(value);