kernel: remove an unused callback from the ip17xx switch driver

Also remove the leftover kernel hack that adds support for it

Signed-off-by: Felix Fietkau <nbd@nbd.name>

target/linux/generic/files/drivers/net/phy/ip17xx.c

@@ -1337,12 +1337,6 @@ static int ip17xx_aneg_done(struct phy_device *pdev)
 	return 1;	/* Return any positive value */
 }
 
-static int ip17xx_update_link(struct phy_device *pdev)
-{
-	pdev->link = 1;
-	return 0;
-}
-
 static int ip17xx_read_status(struct phy_device *pdev)
 {
 	pdev->speed = SPEED_100;
@@ -1364,7 +1358,6 @@ static struct phy_driver ip17xx_driver[] = {
 		.config_init	= ip17xx_config_init,
 		.config_aneg	= ip17xx_config_aneg,
 		.aneg_done	= ip17xx_aneg_done,
-		.update_link	= ip17xx_update_link,
 		.read_status	= ip17xx_read_status,
 	}
 };

target/linux/generic/hack-5.4/702-phy_add_aneg_done_function.patch

@@ -1,27 +0,0 @@
---- a/include/linux/phy.h
-+++ b/include/linux/phy.h
-@@ -524,6 +524,12 @@ struct phy_driver {
- 	/* Determines the negotiated speed and duplex */
- 	int (*read_status)(struct phy_device *phydev);
- 
-+	/* 
-+	 * Update the value in phydev->link to reflect the 
-+	 * current link value
-+	 */
-+	int (*update_link)(struct phy_device *phydev);
-+
- 	/* Clears any pending interrupts */
- 	int (*ack_interrupt)(struct phy_device *phydev);
- 
---- a/drivers/net/phy/phy_device.c
-+++ b/drivers/net/phy/phy_device.c
-@@ -1912,6 +1912,9 @@ int genphy_update_link(struct phy_device
- 	if (bmcr & BMCR_ANRESTART)
- 		goto done;
- 
-+	if (phydev->drv && phydev->drv->update_link)
-+		return phydev->drv->update_link(phydev);
-+
- 	/* The link state is latched low so that momentary link
- 	 * drops can be detected. Do not double-read the status
- 	 * in polling mode to detect such short link drops.