tools/power/x86/intel-speed-select: Account for missing sysfs for die_id

Some older kernels will not have support to get CPU die_id from the
sysfs. This requires several back ports. But the tool depends on getting
die_id to match to correct CPU.

Relax this restriction and use die_id as 0 when die_id is missing. This
is not a problem as we don't have any multi-die processors with Intel SST
support.

This helps in running this tool on older kernels with just Intel SST
drivers back ported.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/platform-driver-x86/57d6648282491906e0e1f70fe3b9a44f72cec90d.camel@intel.com/Signed-off-by: Hans de Goede <hdegoede@redhat.com>

tools/power/x86/intel-speed-select/isst-config.c

@@ -328,8 +328,12 @@ int get_physical_die_id(int cpu)
 		int core_id, pkg_id, die_id;
 
 		ret = get_stored_topology_info(cpu, &core_id, &pkg_id, &die_id);
-		if (!ret)
+		if (!ret) {
+			if (die_id < 0)
+				die_id = 0;
+
 			return die_id;
+		}
 	}
 
 	if (ret < 0)