net: phy: marvell: make some functions static

functions m88e1510_get_temp_critical, m88e1510_set_temp_critical and
m88e1510_get_temp_alarm can be made static as they not need to be
in global scope.

Cleans up sparse warnings:
 "symbol 'm88e1510_get_temp_alarm' was not declared. Should it be static?"
 "symbol 'm88e1510_get_temp_critical' was not declared. Should it be
  static?"
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/phy/marvell.c

@@ -1706,7 +1706,7 @@ static int m88e1510_get_temp(struct phy_device *phydev, long *temp)
 	return ret;
 }
 
-int m88e1510_get_temp_critical(struct phy_device *phydev, long *temp)
+static int m88e1510_get_temp_critical(struct phy_device *phydev, long *temp)
 {
 	int oldpage;
 	int ret;
@@ -1737,7 +1737,7 @@ int m88e1510_get_temp_critical(struct phy_device *phydev, long *temp)
 	return ret;
 }
 
-int m88e1510_set_temp_critical(struct phy_device *phydev, long temp)
+static int m88e1510_set_temp_critical(struct phy_device *phydev, long temp)
 {
 	int oldpage;
 	int ret;
@@ -1767,7 +1767,7 @@ int m88e1510_set_temp_critical(struct phy_device *phydev, long temp)
 	return ret;
 }
 
-int m88e1510_get_temp_alarm(struct phy_device *phydev, long *alarm)
+static int m88e1510_get_temp_alarm(struct phy_device *phydev, long *alarm)
 {
 	int oldpage;
 	int ret;