Exclude Core 0 for memory latency benchmark

[ManniX]

Would be possible to avoid using Core 0 for the latency benchmark?

Core 0 is always running some small threads that can't be moved somewhere else.

Almost never in an AMD CPU is the best core; it'd be nice if AIDA would select the best CPPC core.

If there are exceptions where Core 0 would be better instead, it could be left as a configurable option.