EntityManager: Remove dead ManagedObjectType definition

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Ibbe63b705b3cb5c5060fbd161ce96e1967c98873
diff --git a/src/EntityManager.cpp b/src/EntityManager.cpp
index adbf134..8f29f92 100644
--- a/src/EntityManager.cpp
+++ b/src/EntityManager.cpp
@@ -66,12 +66,6 @@
                  int64_t, uint64_t, double, int32_t, uint32_t, int16_t,
                  uint16_t, uint8_t, bool>;
 
-using ManagedObjectType = boost::container::flat_map<
-    sdbusplus::message::object_path,
-    boost::container::flat_map<
-        std::string,
-        boost::container::flat_map<std::string, DBusValueVariant>>>;
-
 // store reference to all interfaces so we can destroy them later
 boost::container::flat_map<
     std::string, std::vector<std::weak_ptr<sdbusplus::asio::dbus_interface>>>