adding support for the Asus K8V-X

adding support for the Asus K8V-X

This pulls it all together and adds the real board-specific code.

Confirmed to be working:
- IDE
- SATA
- floppy
- USB1.1
- USB2.0
- PS/2 keyboard
- PS/2 mouse
- serial
- parport
- sound
- ethernet
- PCI slots
- AGP
- powernow
- fan speed monitoring
- flashrom write

Change-Id: Ifb97714c2f009d688be0ca3c38ddc01599ffd799
Signed-off-by: Florian Zumbiehl <florz@florz.de>
Reviewed-on: http://review.coreboot.org/390
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>
Tested-by: build bot (Jenkins)