net: aquantia: Make local functions static

Fixes the following sparse warnings:

drivers/net/ethernet/aquantia/atlantic/aq_ethtool.c:224:5: warning:
 symbol 'aq_ethtool_get_coalesce' was not declared. Should it be static?
drivers/net/ethernet/aquantia/atlantic/aq_ethtool.c:245:5: warning:
 symbol 'aq_ethtool_set_coalesce' was not declared. Should it be static?
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/aquantia/atlantic/aq_ethtool.c

@@ -221,8 +221,8 @@ static int aq_ethtool_get_rxnfc(struct net_device *ndev,
 	return err;
 }
 
-int aq_ethtool_get_coalesce(struct net_device *ndev,
-			    struct ethtool_coalesce *coal)
+static int aq_ethtool_get_coalesce(struct net_device *ndev,
+				   struct ethtool_coalesce *coal)
 {
 	struct aq_nic_s *aq_nic = netdev_priv(ndev);
 	struct aq_nic_cfg_s *cfg = aq_nic_get_cfg(aq_nic);
@@ -242,8 +242,8 @@ int aq_ethtool_get_coalesce(struct net_device *ndev,
 	return 0;
 }
 
-int aq_ethtool_set_coalesce(struct net_device *ndev,
-			    struct ethtool_coalesce *coal)
+static int aq_ethtool_set_coalesce(struct net_device *ndev,
+				   struct ethtool_coalesce *coal)
 {
 	struct aq_nic_s *aq_nic = netdev_priv(ndev);
 	struct aq_nic_cfg_s *cfg = aq_nic_get_cfg(aq_nic);