net: stmmac: qcom-ethqos: remove speed_mode_2500() method

qcom-ethqos doesn't need to implement the speed_mode_2500() method as
it is only setting priv->plat->phy_interface to 2500BASE-X, which is
already a pre-condition for assigning speed_mode_2500 in
qcom_ethqos_probe(). So, qcom_ethqos_speed_mode_2500() has no effect.
Remove it.

Signed-off-by: Russell King (Oracle) <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Russell King (Oracle)

drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c

@@ -672,13 +672,6 @@ static int ethqos_configure_sgmii(struct qcom_ethqos *ethqos, int speed)
 	return val;
 }
 
-static void qcom_ethqos_speed_mode_2500(struct net_device *ndev, void *data)
-{
-	struct stmmac_priv *priv = netdev_priv(ndev);
-
-	priv->plat->phy_interface = PHY_INTERFACE_MODE_2500BASEX;
-}
-
 static int ethqos_configure(struct qcom_ethqos *ethqos, int speed)
 {
 	return ethqos->configure_func(ethqos, speed);
@@ -800,8 +793,6 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
 		ethqos->configure_func = ethqos_configure_rgmii;
 		break;
 	case PHY_INTERFACE_MODE_2500BASEX:
-		plat_dat->speed_mode_2500 = qcom_ethqos_speed_mode_2500;
-		fallthrough;
 	case PHY_INTERFACE_MODE_SGMII:
 		ethqos->configure_func = ethqos_configure_sgmii;
 		break;