[LinuxBIOS] Proposed change to amdk8 memory controller code

[San Mehat]

Greets,

I've made some modifications locally here to the amdk8 memory code and
wanted to just chuck them out there to see what you guys think:

1 - Renamed DIMM_SOCKETS define to DIMM_SOCKETS_PER_CHANNEL since thats what
it actually is.
2 - Added 'channel0_pop' and 'channel1_pop' to 'struct mem_controller' and
modified 'raminit.c' to fill this in with the physical DIMM population map.

For us knowing the detected DIMM population map *at the mainboard level* is
very usefull.

Fire away ;)

-San