Provide "_dup7.4" suffix to the driver version in order to differentiate it
from the inbox driver.
Index: src/drivers/net/ethernet/intel/i40evf/i40evf_main.c
===================================================================
--- src.orig/drivers/net/ethernet/intel/i40evf/i40evf_main.c	2018-02-27 18:43:25.698521323 +0100
+++ src/drivers/net/ethernet/intel/i40evf/i40evf_main.c	2018-02-27 18:45:06.292463555 +0100
@@ -42,7 +42,7 @@
 static const char i40evf_driver_string[] =
 	"Intel(R) 40-10 Gigabit Virtual Function Network Driver";
 
-#define DRV_KERN "-k"
+#define DRV_KERN "-k_dup7.4"
 
 #define DRV_VERSION_MAJOR 3
 #define DRV_VERSION_MINOR 0