Remove direct uses of mapbox

sdbusplus is moving to std::variant, remove direct
uses of mapbox to limit breakage.

Tested-by: It built

Change-Id: I3fe0ba0d96b6aad302927363b9596cc1bcce2393
Signed-off-by: James Feist <james.feist@linux.intel.com>
diff --git a/sensordatahandler.cpp b/sensordatahandler.cpp
index f5c1e53..c973f2e 100644
--- a/sensordatahandler.cpp
+++ b/sensordatahandler.cpp
@@ -260,7 +260,7 @@
 
     for (const auto& property : interface->second)
     {
-        Value tmp{mapbox::util::no_init()};
+        Value tmp{sdbusplus::message::variant_ns::no_init()};
         for (const auto& value : std::get<OffsetValueMap>(property.second))
         {
             if (bothSet.size() <= value.first || !bothSet.test(value.first))