[flashrom] ASUS A7V8X-MX board support

[François Revol]

(note I'm not subscribed to the list)

This patch adds support for the ASUS A7V8X-MX motherboard.

Before, despite being mentionned as supported on
http://flashrom.org/Supported_hardware , flashrom failed to detect the
flash chip:

http://paste.flashrom.org/view.php?id=2041

After, the flash chip is detected:

http://paste.flashrom.org/view.php?id=2044

It seems the trick is the same as for the MX-SE variant, which is
already in.

I didn't try flashing as the only other chip I have doesn't seem to be
detected, probably because of incompatible pinout due to it being
LPC/FWH instead of parallel.

François.