[PATCH] via-rhine: link state fix

Problems with link state detection have been reported several times in the
past months.

Denis Vlasenko did all the work tracking it down. Jeff Garzik suggested the
proper place for the fix.

When using the mii library, the driver needs to check mii->force_media
and set dev->state accordingly.

Signed-off-by: Roger Luethi <rl@hellgate.ch>
Signed-off-by: Jeff Garzik <jeff@garzik.org>