[coreboot] [PATCH] Geode GX2 auto DRAM detect patch

[Nils]

This patch brings the adapted Geode LX auto DRAM detect code  to GX2 ,
cleans up some files and adds a processor speed setting function in human 
readable Mhz.

Signed-off-by: Nils Jacobs

It is Abuild and boot tested on my Wyse S50 with 3 different SODIMMs (128Mb 
pc2700, 256Mb pc2100, 512Mb pc2700) and each dimm with all three speed 
settings.
(my S50 runs linux under as well as overclocked at 400Mhz!)

Thanks to Jens Rottmann for providing the memory chip types for the Lippert 
Frontrunner.

Thanks, Nils.