Remove 'cpuid', 'pstate' and 'rdt' feature sources and move their
functionality under the 'cpu' source. The goal is to have a more
systematic organization of feature sources and labels. After this change
we now basically have one source per type of hw, one for kernel and one
for userspace sw.
Related feature labels are changed, correspondingly, new labels being:
feature.node.k8s.io/cpu-cpuid.<cpuid flag>
feature.node.k8s.io/cpu-pstate.turbo
feature.node.k8s.io/cpu-rdt.<rdt feature>
Get rid of the dependency on intel-cmt-cat library and rdt helper
binaries written in C. Significantly simplifies the build procedure.
Implements minimal support (in assembler) for getting the raw data from
the CPUID instruction. Also, implement a stub so that the code works on
other architectures than amd64, too.
