net: phy: micrel: Add ksz9131_resume()

The Renesas RZ/G3E SMARC EVK uses KSZ9131RNXC phy. On deep power state,
PHY loses the power and on wakeup the rgmii delays are not reconfigured
causing it to fail.

Replace the callback kszphy_resume()->ksz9131_resume() for reconfiguring
the rgmii_delay when it exits from PM suspend state.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20250711054029.48536-1-biju.das.jz@bp.renesas.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: bijudas

drivers/net/phy/micrel.c

@@ -5633,6 +5633,14 @@ static int lan8841_suspend(struct phy_device *phydev)
 	return kszphy_generic_suspend(phydev);
 }
 
+static int ksz9131_resume(struct phy_device *phydev)
+{
+	if (phydev->suspended && phy_interface_is_rgmii(phydev))
+		ksz9131_config_rgmii_delay(phydev);
+
+	return kszphy_resume(phydev);
+}
+
 static struct phy_driver ksphy_driver[] = {
 {
 	.phy_id		= PHY_ID_KS8737,
@@ -5879,7 +5887,7 @@ static struct phy_driver ksphy_driver[] = {
 	.get_strings	= kszphy_get_strings,
 	.get_stats	= kszphy_get_stats,
 	.suspend	= kszphy_suspend,
-	.resume		= kszphy_resume,
+	.resume		= ksz9131_resume,
 	.cable_test_start	= ksz9x31_cable_test_start,
 	.cable_test_get_status	= ksz9x31_cable_test_get_status,
 	.get_features	= ksz9477_get_features,