The software prefetching of HW descriptors has a negative impact on
the performance. Therefore, it is now removed.

Performance for the rx_drop benchmark increased with 2%.
Signed-off-by: NBjörn Töpel <bjorn.topel@intel.com>
Tested-by: NAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: NTony Nguyen <anthony.l.nguyen@intel.com>