tools/power/x86/intel-speed-select: Cleanup get_physical_id usage

struct isst_id already contains package and die id information, thus
there is no need to get the package and die id information, when struct
isst_id is already available.

Remove unneeded get_physical_package_id/get_physical_die_id usage.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>