via-velocity: fix speed and link status reported by ethtool

The via-velocity driver reports incorrect speed and link detected status
as viewed by ethtool (and probably other tools). This patch fixes those
incorrect reports and prettifies a long line.

Signed-off-by: Jay Cliburn <jacliburn@bellsouth.net>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>