tools/power/x86/intel-speed-select: Fix cpu count for TDP level display

In the function isst_ctdp_display_information(), call to the function
get_cpu_count() is using get_physical_die_id() instead of
get_physical_package_id(). This will result in wrong display of
CPU count in that level.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
[ Srinivas Pandruvada: fixed subject and change log ]
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>