python: different import for dealing with demandimport

src/python/m5/__init__.py

@@ -32,10 +32,10 @@
 
 try:
     # Try to import something that's generated by swig
-    import internal.core
+    import internal
 
     # Try to grab something from it in case demandimport is being used
-    internal.core.__package__
+    internal.core.curTick
 except ImportError:
     # The import failed
     internal = None