via82cxxx: fix SATA cable detection

Add VIA_SATA_PATA flag for cx700, vx800 and vx855 chipsets
(the first port is SATA).

Based on commits 7585eb1b, bfce5e01 and e4d866cd for pata_via
host driver.

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