[LinuxBIOS] CONFIG_LB_MEM_TOPK

[Lu, Yinghai]

I'm going to check in new cache_as_ram code. It is more solid and could
copy data from cache to ram. So we can pass some info from CAR stage to
RAM stage.

I want to change the default value for CONFIG_LB_MEM_TOPK from 1024 to
2048.
So I don't need to change every Opteron MB Config.lb...

Let me know if is ok to you.

YH