intel: add SPDX identifiers to all the Intel drivers

Add the SPDX identifiers to all the Intel wired LAN driver files, as
outlined in Documentation/process/license-rules.rst.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_trace.h b/drivers/net/ethernet/intel/i40evf/i40e_trace.h
index 9a5100b..ece01dd 100644
--- a/drivers/net/ethernet/intel/i40evf/i40e_trace.h
+++ b/drivers/net/ethernet/intel/i40evf/i40e_trace.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*******************************************************************************
  *
  * Intel(R) 40-10 Gigabit Ethernet Virtual Function Driver