This change allows us to see the spd on the s850, finally.

This change allows us to see the spd on the s850, finally.
There is an i2c mux out there. We found it using a user level program
that, as usual, began by inverting all gpios until we found out
what we needed to know. In the end, we just set up the GPIOs as
the factory bios does.

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Acked-by: Myles Watson <mylesgw@gmail.com>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4755 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1