lan78xx: change to use updated phy-ignore-interrupts

Update lan78xx to use patch of commit 4f2aaf7d


("Merge branch 'fix-phy-ignore-interrupts'").

Signed-off-by: Woojung Huh <woojung.huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>