[coreboot] GCC update broke AMD Fam10h boot

[Timothy Pearson]

All,

Just a heads up as there is no bugtracker for this project.  GIT commit 
53c388fe, which updates the crossgcc GCC version from 4.8.3 to 4.9.2, 
breaks ramstage on AMD Fam10h systems (ramstage loads, sends its 0x39 
POST code, but then goes into an infinite loop).  Downgrading the GCC 
version repairs the boot failure.

Not sure if you want to revert that commit until someone can figure out 
what changed to cause the problem.