kernel: add missing patch

This patch was accidentally dropped.

Signed-off-by: John Crispin <john@phrozen.org>

target/linux/generic/hack-4.9/702-phy_add_aneg_done_function.patch

@@ -0,0 +1,27 @@
+--- a/include/linux/phy.h
++++ b/include/linux/phy.h
+@@ -499,6 +499,12 @@ 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
+@@ -1309,6 +1309,9 @@ int genphy_update_link(struct phy_device
+ {
+ 	int status;
+ 
++	if (phydev->drv && phydev->drv->update_link)
++		return phydev->drv->update_link(phydev);
++
+ 	/* Do a fake read */
+ 	status = phy_read(phydev, MII_BMSR);
+ 	if (status < 0)