configs,python: Clean some cruft out of m5.objects.

SimObject is already available as m5.SimObject, and it doesn't make a
lot of sense to expose m5.internal.params, part of the internals of
gem5's python interface, as a peer to all the SimObject types.

Change-Id: I3030c1eb261877fd9648c9d3d73b7dbbd4c24345
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48364
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/python/m5/SimObject.py

@@ -1716,6 +1716,9 @@ class SimObject(object, metaclass=MetaSimObject):
         if self._ccParams:
             return self._ccParams
 
+        # Ensure that m5.internal.params is available.
+        import m5.internal.params
+
         cc_params_struct = getattr(m5.internal.params, '%sParams' % self.type)
         cc_params = cc_params_struct()
         cc_params.name = str(self)