igc: Add multiple receive queues control supporting

Enable the multi queues to receive.
Program the direction of packets to specified queues according
to the mode selected in the MRQC register.
Multiple receive queues defined by filters and RSS for 4 queues.
Enable/disable RSS hashing and also to enable multiple receive queues.
This patch will allow further ethtool support development.

Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>