[coreboot] [PATCH] Fix some of our boards

[Patrick Georgi]

Hi,

attached patch reduces the size of the romstage of various boards to 
36kb. As this breaks the automatic XIP mechanism (which requires sizes 
in powers of two), I added a XIP region of 128kb, which spans both 
images (and some more).
This should fix the build of all currently broken (see qa.coreboot.org) 
x86 boards. The PPC boards have a different issue and will be handled 
separately.

Signed-off-by: Patrick Georgi