cxgbe(4): Updates to the default and hashfilter configurations.
- Do not use nvf = 4 as it is not really supported by the firmware. Firmwares 1.23.3.0 and above will ignore it silently.
- Increase PF4's share of the VIs and let it use all of the RSS table.
MFC after: 2 weeks
Sponsored by: Chelsio Communications