net: phy: fix warnings with W=1

get_phy_id is marked weak but has no protype nor a
strong version, just make it static. Use __weak for
board_phy_config.
Signed-off-by: NJeroen Hofstee <jeroen@myspectrum.nl>

drivers/net/phy/phy.c

@@ -575,7 +575,7 @@ static struct phy_device *phy_device_create(struct mii_dev *bus, int addr,
  * Description: Reads the ID registers of the PHY at @addr on the
  *   @bus, stores it in @phy_id and returns zero on success.
  */
-int __weak get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
+static int get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
 {
 	int phy_reg;
 
@@ -785,16 +785,13 @@ int phy_startup(struct phy_device *phydev)
 	return 0;
 }
 
-static int __board_phy_config(struct phy_device *phydev)
+__weak int board_phy_config(struct phy_device *phydev)
 {
 	if (phydev->drv->config)
 		return phydev->drv->config(phydev);
 	return 0;
 }
 
-int board_phy_config(struct phy_device *phydev)
-	__attribute__((weak, alias("__board_phy_config")));
-
 int phy_config(struct phy_device *phydev)
 {
 	/* Invoke an optional board-specific helper */