lscpu: add --physical option

lscpu: add --physical option

With the --physical option lscpu will use the IDs that are reported by
the kernel (e.g. core id for the CORE column) instead of calculating
them on it's own.

This has the advantage that it is possible to tell on which physical
hardware CPUs a Linux instance runs. The logical IDs that lscpu
generates on it own are based on comparing of CPU masks and may or may
not be identical with the physical IDs.

If the kernel was unable to retrieve an ID for a topology element then
the corresponding sysfs file will normally contain "-1". In the
extended and parsable output a dash "-" will be displayed for such
cases.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>