[wlgen] CPUs specification not working on SMP platorms
Created by: derkling
Reported by @jlelli
When running on a non big.LITTLE system, pinning tasks based on CPUs type specifiers like "bigs_first" is not possible because of the missing "bl" module in devlib.
However, still we want to be able to run workloads defined using these attributes. Thus, we need to map these configuration options to proper CPUs.