net: phy: DP83TC811: Fix WoL in config init to be disabled

The WoL feature should be disabled when config_init is called and the
feature should turned on or off  when set_wol is called.

In addition updated the calls to modify the registers to use the set_bit
and clear_bit function calls.

Fixes: 6d749428788b ("net: phy: DP83TC811: Introduce support for the
DP83TC811 phy")
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>