ahci: add PCI ID for new VIA chip

Add PCI ID for new VIA chip.  Original patch is from Maarten Vanraes.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Maarten Vanraes <maarten.vanraes@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>