thermal: intel: selftests: workload_hint: Mask unsupported types

The workload hint may contain some other hints which are not defined.
So mask out unsupported types. Currently only lower 4 bits of workload
type hints are defined.

Signed-off-by: Srinivas Pandruvada <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
[ rjw: Subject cleanup ]
Signed-off-by: Rafael J. Wysocki <[e-mail]>

tools/testing/selftests/thermal/intel/workload_hint/workload_hint_test.c

···
 			ret = sscanf(index_str, "%d", &index);
 			if (ret < 0)
 				break;
+
+			index &= 0x0f;
 			if (index > WORKLOAD_TYPE_MAX_INDEX)
 				printf("Invalid workload type index\n");
 			else