account_service: Remove unused DbusInterfaceType

DbusInterfaceType was replaced by dbus::utility::DBusInteracesMap.

A grep of the code shows that DbusInterfaceType is not used, so
we can safely remove it to avoid anyone using it in the future.

Signed-off-by: Jason M. Bills <jason.m.bills@intel.com>
Change-Id: I58ab451157186a90d946985a65ba965b3c8fad7c
diff --git a/redfish-core/lib/account_service.hpp b/redfish-core/lib/account_service.hpp
index 5530e12..df7279e 100644
--- a/redfish-core/lib/account_service.hpp
+++ b/redfish-core/lib/account_service.hpp
@@ -67,10 +67,6 @@
     std::vector<std::pair<std::string, LDAPRoleMapData>> groupRoleList;
 };
 
-using DbusInterfaceType = boost::container::flat_map<
-    std::string,
-    boost::container::flat_map<std::string, dbus::utility::DbusVariantType>>;
-
 using GetObjectType =
     std::vector<std::pair<std::string, std::vector<std::string>>>;