net: hisilicon: mark symbols static where possible

We get 2 warnings when building kernel with W=1:
drivers/net/ethernet/hisilicon/hisi_femac.c:943:5: warning: no previous prototype for 'hisi_femac_drv_suspend' [-Wmissing-prototypes]
drivers/net/ethernet/hisilicon/hisi_femac.c:960:5: warning: no previous prototype for 'hisi_femac_drv_resume' [-Wmissing-prototypes]

In fact, these two functions are only used in the file in which they are
declared and don't need a declaration, but can be made static.
so this patch marks these functions with 'static'.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hisi_femac.c

@@ -940,7 +940,7 @@ static int hisi_femac_drv_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM
-int hisi_femac_drv_suspend(struct platform_device *pdev,
+static int hisi_femac_drv_suspend(struct platform_device *pdev,
 				  pm_message_t state)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
@@ -957,7 +957,7 @@ int hisi_femac_drv_suspend(struct platform_device *pdev,
 	return 0;
 }
 
-int hisi_femac_drv_resume(struct platform_device *pdev)
+static int hisi_femac_drv_resume(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct hisi_femac_priv *priv = netdev_priv(ndev);