enic: Change min MTU

Change min MTU to 68.
Signed-off-by: Vasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: David Wang <dwang2@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/enic/enic_res.h

@@ -30,7 +30,7 @@
 #define ENIC_MIN_RQ_DESCS		64
 #define ENIC_MAX_RQ_DESCS		4096
 
-#define ENIC_MIN_MTU			576  /* minimum for IPv4 */
+#define ENIC_MIN_MTU			68
 #define ENIC_MAX_MTU			9000
 
 #define ENIC_MULTICAST_PERFECT_FILTERS	32