ObjectMapper; revert service and intf name change

Partial fix for openbmc/openbmc#1112.

Change-Id: If5160f0f7d3070afa94121b40820b88e419b15b7
diff --git a/utils.cpp b/utils.cpp
index efcc071..168f89f 100644
--- a/utils.cpp
+++ b/utils.cpp
@@ -16,9 +16,9 @@
     auto bus = sdbusplus::bus::new_default();
     auto mapper =
         bus.new_method_call(
-            "xyz.openbmc_project.object_mapper",
+            "xyz.openbmc_project.ObjectMapper",
             "/xyz/openbmc_project/object_mapper",
-            "xyz.openbmc_project.object_mapper",
+            "xyz.openbmc_project.ObjectMapper",
             "GetObject");
 
     mapper.append(pimPath);