net: phy: smsc: Deduplicate interrupt acknowledgement upon phy_init_hw()

Since commit 4c0d2e96 ("net: phy: consider that suspend2ram may cut
off PHY power"), phy_init_hw() invokes both, the ->config_init() and
->config_intr() callbacks.

In the SMSC PHY driver, the latter acknowledges stale interrupts, hence
there's no longer a need to acknowledge them in the former as well.

There are no other callers of ->config_init() besides phy_init_hw().

Drop the redundant code.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Link: https://lore.kernel.org/r/0254edf48bddc96c6248c4414043a3699e94614a.1655716767.git.lukas@wunner.deSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/smsc.c

@@ -121,10 +121,7 @@ static int smsc_phy_config_init(struct phy_device *phydev)
 	/* Enable energy detect mode for this SMSC Transceivers */
 	rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
 		       rc | MII_LAN83C185_EDPWRDOWN);
-	if (rc < 0)
-		return rc;
-
-	return smsc_phy_ack_interrupt(phydev);
+	return rc;
 }
 
 static int smsc_phy_reset(struct phy_device *phydev)
@@ -146,11 +143,6 @@ static int smsc_phy_reset(struct phy_device *phydev)
 	return genphy_soft_reset(phydev);
 }
 
-static int lan911x_config_init(struct phy_device *phydev)
-{
-	return smsc_phy_ack_interrupt(phydev);
-}
-
 static int lan87xx_config_aneg(struct phy_device *phydev)
 {
 	int rc;
@@ -418,9 +410,6 @@ static struct phy_driver smsc_phy_driver[] = {
 
 	.probe		= smsc_phy_probe,
 
-	/* basic functions */
-	.config_init	= lan911x_config_init,
-
 	/* IRQ related */
 	.config_intr	= smsc_phy_config_intr,
 	.handle_interrupt = smsc_phy_handle_interrupt,