net: phy: at803x: remove set/get wol callbacks for AR8032

Since the AR8032 part does not support wol, remove related callbacks
from it.

Fixes: 5800091a

 ("net: phy: at803x: add support for AR8032 PHY")
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Cc: David Bauer <mail@david-bauer.net>
Signed-off-by: David S. Miller <davem@davemloft.net>