[PATCH] sata_via: Add SATA support for vt8237a

This patch adds support for the VIA Technologies VT8237A SATA controller,
used, for example, on the ASUS M2V socket AM2 motherboard.

Signed-off-by: Jay Cliburn <jacliburn@bellsouth.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>