Restructure - pkg/intel

[ChriMarMe]

I want to introduce the required structures for Intel BootGuard. The existing directory structure does not allow for CBnT and BootGuard existance in parallel.

Any suggestions to handle it @xaionaro ?

[ChriMarMe]

pkg/intel/common
pkg/intel/me
pkg/intel/metadata/cbnt
pkg/intel/metadata/bootguard

This allows us to introduce bootguard structures in parallel, even if we have dublicate code, which certainly will happen because BootGuard and CBnT share a lot, but differ in some places.