atl1c: add PHY link event(up/down) patch

On some platforms the PHY settings need to change depending on the
cable link status to get better stability.

Signed-off-by: xiong <xiong@qca.qualcomm.com>
Tested-by: Liu David <dwliu@qca.qualcomm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>