Refactor the cpuid crate

[serban300]

Refactor the cpuid crate in order to make it easier to add support for new CPUs

Make sure it doesn't affect the boot time

[serban300]

filter_cpuid execution time (cpu clock) before refactoring: 6-11 usec

[andreeaflorescu]

It looks like we should start the work on this with an integration test. It is rather tricky to catch regressions otherwise.

[serban300]

I will try to do this incrementally. The first iterations should be covered by the unit tests. I will add an integration test as soon as it is needed.