gianfar: remove orphan struct.

struct net_device_stats is no longer used in driver's private
struct but in struct net_device.

Cc: Li Yang <leoli@freescale.com>
Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/gianfar.h

@@ -749,7 +749,6 @@ struct gfar_private {
 	uint32_t msg_enable;
 
 	/* Network Statistics */
-	struct net_device_stats stats;
 	struct gfar_extra_stats extra_stats;
 };