i40iw: virtual channel handling files

i40iw_vf.[ch] and i40iw_virtchnl[ch] are used for virtual
channel support for iWARP VF module.

Changes since v2:
	code cleanup

Acked-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Acked-by: Shannon Nelson <shannon.nelson@intel.com>
Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>