uti: Identify uti thread by clone count

--uti-thread-count <count> is added to mcexec.

Change-Id: Id9ec464412a5bb71e4d9e87d05f79de22d35b067

kernel/include/process.h

@@ -556,6 +556,8 @@ struct process {
 	size_t mpol_threshold;
 	unsigned long heap_extension;
 	unsigned long mpol_bind_mask;
+	int uti_thread_rank; /* Spawn on Linux CPU when clone_count reaches this */
+	int clone_count;
 
 	// perf_event
 	int perf_status;