net: bcm63xx_enet: Fix build failure with phy_ethtool_nway_reset

Introduced a typo making the driver no longer build, *sigh*.

Fixes: 42469bf5 ("net: bcm63xx_enet: Utilize phy_ethtool_nway_reset")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>