[openib-general] port num in port priv

[Suresh Shelvapille]

> 
> Unfortunately the sysfs PMA counters support will not be that useful,
> since it will only show counters for port 0; but that's a different issue.
> 
>  - R.
[SS] That's a bummer, so don't we need to create as many file descriptors as
the number of physical ports on a switch, so that we can gather different
port related stats from the device locally (not talking about subnet manager
queries)!

Thanks,
Suri