gianfar: Make reset_gfar static

Fix sparse warning:

drivers/net/ethernet/freescale/gianfar.c:2070:6:
warning: symbol 'reset_gfar' was not declared. Should it be static?

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: YueHaibing <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/freescale/gianfar.c

···
 	return 0;
 }
 
-void reset_gfar(struct net_device *ndev)
+static void reset_gfar(struct net_device *ndev)
 {
 	struct gfar_private *priv = netdev_priv(ndev);