Fixing the gmac4 mdio write access to use MII_GMAC4_WRITE only instead of
OR together with MII_WRITE.
Signed-off-by: NKweh, Hock Leong <hock.leong.kweh@intel.com>
Acked-By: NJoao Pinto <jpinto@synopsys.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>