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. I don't have a system with this RedundancySensor
enabled. But code inspection can show that only ObjectManager patch
changed.

Signed-off-by: Nan Zhou <nanzhoumails@gmail.com>
Change-Id: Ic2437b36f3303ab3e74c579ed5a268bf5824d0d6
diff --git a/src/FanMain.cpp b/src/FanMain.cpp
index 9d495e0..9283fde 100644
--- a/src/FanMain.cpp
+++ b/src/FanMain.cpp
@@ -221,7 +221,7 @@
             }
         }
         },
-        "xyz.openbmc_project.EntityManager", "/",
+        "xyz.openbmc_project.EntityManager", "/xyz/openbmc_project/inventory",
         "org.freedesktop.DBus.ObjectManager", "GetManagedObjects");
 }