via82cxxx: vx855 is a single channel controller

Based on commit e4d866cd for pata_via host driver
(PCI ID was later changed by commit 5993856e).

Update my credits while at it.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>