tools/power/x86/intel-speed-select: Skip uncore frequency update

On SST PP level switch, skip adjusting the uncore frequency limit and
allow the hardware to handle this on newer platforms.

As newer generations of CPUs have changed the extended family identifier,
use this identifier to exclude the update.

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