iavf: finish renaming files to iavf

This finishes the process of renaming the files that
make sense to rename (skipping adminq related files that
talk to i40e), and fixes up the build and the #includes
so that everything builds nicely.

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>