cpumask: convert kernel trace functions further

Impact: Reduce future memory usage, use new cpumask API.

Since the last patch was created and acked, more old cpumask users
slipped into kernel/trace.

Mostly trivial conversions, except struct trace_iterator's "started"
member becomes a cpumask_var_t.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

kernel/trace/trace.h

@@ -368,7 +368,7 @@ struct trace_iterator {
 	loff_t			pos;
 	long			idx;
 
-	cpumask_t		started;
+	cpumask_var_t		started;
 };
 
 int tracing_is_enabled(void);