Use config.h constants

The mapper related D-Bus names are already defined in config.h,
so start using them in mapperx.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I9e75b9fad9c0c8144fe9c217aaab1cec5b8dbd57
diff --git a/src/processing.cpp b/src/processing.cpp
index 6cc876d..2dfebfd 100644
--- a/src/processing.cpp
+++ b/src/processing.cpp
@@ -1,3 +1,5 @@
+#include "config.h"
+
 #include "processing.hpp"
 
 #include <boost/algorithm/string/predicate.hpp>
@@ -76,8 +78,7 @@
             // we own this path as well, which would be because of an
             // association.
             if ((pathIt->second.size() == 2) &&
-                (pathIt->second.find("xyz.openbmc_project.ObjectMapper") !=
-                 pathIt->second.end()))
+                (pathIt->second.find(MAPPER_BUSNAME) != pathIt->second.end()))
             {
                 // Remove the 2 association D-Bus paths and move the
                 // association to pending.