Simplify the opening of the resources for cardbus cards. Before we'd

Simplify the opening of the resources for cardbus cards.  Before we'd
try very hard to be perfect.  However, these attempts broke down when
there were large numbers of resources.  We'd not be able to map them all.

Instead, accept that we might pass more range to thse subbus than
might be optimal be able to compute.  However, there's little harm in
this and it allows us to pass greater resources through.

# it has been suggested that we allocate a fixed amount of resources
# on attach and give it out upon request.  This might not be a bad idea...