x86: avoid invalid phys_proc_id reference

x86: avoid invalid phys_proc_id reference

phys_proc_id is invalidated in remove_siblinginfo() which gets called
before cpu_smpboot_free(). This means calling cpu_to_socket(cpu) in
cpu_smpboot_free() is not possible to be correct.

This patch moves the invalidating of phys_proc_id from
remove_siblinginfo() to cpu_smpboot_free() so that cpu_to_socket(cpu)
can be used in cpu_smpboot_free().

The same is done for cpu_core_id/compute_unit_id and due to that
cpu_sibling_setup_map is private to the file so it's moved as well.

Reported-by: Dario Faggioli <dario.faggioli@citrix.com>
Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>