iavf: diet and reformat

Remove a bunch of unused code and reformat a few lines. Also
remove some now un-necessary files.

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>