[coreboot] SerialICE-based patch for s2895

[Myles Watson]

These two patches make the SerialICE output match a lot better.  I'm
not sure which part is the magic one, but my board works better on a
reset now.  I may get around to cleaning it up so that only things
that matter get changed, but it isn't likely to happen very soon.

I'm not suggesting that this should be applied, but I'd like to save
anyone else who needs to do this some work.  If I were to apply it,
I'd force most of the extra stuff into the CK804_MB_SETUP, or
something similar, since I've only tested this on s2895.

Signed-off-by: Myles Watson

Thanks,
Myles