Add VIA VT82C686A/VT82C686B detection support to superiotool.

Add VIA VT82C686A/VT82C686B detection support to superiotool.

This adds an additional requirement to superiotool: libpci.
The PCI code is conditional on PCI_SUPPORT. You can set the
CONFIG_PCI variable in the Makefile to 'no' to disable it.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5047 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1