Flashrom: add support for ASUS P5A (Socket 7, ALi based).

Flashrom: add support for ASUS P5A (Socket 7, ALi based).

* Add support for the ALi M1533 to chipset_enable.c
* Add some SMBus poking needed for the ASUS P5A, to board_enable.c

Since PCI subsystem IDs are worthless with this board, people will
have to name the board directly.

Signed-off-by: Luc Verhaegen <libv@skynet.be>
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2677 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1