treewide: change EM's ObjectManager path

EntityManager moves its ObjectManager in commit [1], this patch is to
change accordingly. Please see [1] for why we made that change.

[1] https://gerrit.openbmc.org/c/openbmc/entity-manager/+/57279

Tested: code compiles.

Signed-off-by: Nan Zhou <nanzhoumails@gmail.com>
Change-Id: Idf5657463d54022f53d12e860483d06b5c5c7ccd
diff --git a/redfish-core/lib/managers.hpp b/redfish-core/lib/managers.hpp
index 1955de1..19c43f1 100644
--- a/redfish-core/lib/managers.hpp
+++ b/redfish-core/lib/managers.hpp
@@ -1423,7 +1423,8 @@
             }
             self->managedObj = mObj;
             },
-            "xyz.openbmc_project.EntityManager", "/", objectManagerIface,
+            "xyz.openbmc_project.EntityManager",
+            "/xyz/openbmc_project/inventory", objectManagerIface,
             "GetManagedObjects");
 
         // at the same time get the profile information