iavf: rename i40e_hw to iavf_hw

Fix up the i40e_hw names to new name, including versions
inside other strings.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>