net: stmmac: improve .set_clk_tx_rate() method error message

Improve the .set_clk_tx_rate() method error message to include the
PHY interface mode along with the speed, which will be helpful to
the RK implementations.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/E1uPjjx-0049r5-NN@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Russell King (Oracle)

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -1062,8 +1062,8 @@ static void stmmac_mac_link_up(struct phylink_config *config,
 						interface, speed);
 		if (ret < 0)
 			netdev_err(priv->dev,
-				   "failed to configure transmit clock for %dMbps: %pe\n",
-				   speed, ERR_PTR(ret));
+				   "failed to configure %s transmit clock for %dMbps: %pe\n",
+				   phy_modes(interface), speed, ERR_PTR(ret));
 	}
 
 	stmmac_mac_set(priv, priv->ioaddr, true);