The tx/rx delay bits in the ETH_XMII_CONTROL register have to be unset when the
enable_rgmii_rx_delay/enable_rgmii_tx_delay will be set in the AT803x PHY.
Othwise the throughput in gigabit mode is heavily reduced.
Signed-off-by: Sven Eckelmann <sven@open-mesh.org>
SVN-Revision: 45521