i40e: Drop packet split receive routine

i40e: Drop packet split receive routine

Orabug: 23176970

As part of preparation for the rx-refactor, remove the
packet split receive routine and ancillary code.

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>
(cherry picked from commit b32bfa17246d836125958e39996a674653e899a5)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Conflicts:
	drivers/net/ethernet/intel/i40e/i40e_txrx.c