tracing, thermal: Hide cpu cooling trace events when not in use

As trace events when defined create data structures and functions to
process them, defining trace events when not using them is a waste of
memory.

The trace events thermal_power_cpu_get_power and
thermal_power_cpu_limit are only used when CONFIG_CPU_THERMAL is set.
Make those events only defined when that is set as well.

Link: http://lkml.kernel.org/r/20171013102309.2c4ef81a@gandalf.local.home

Cc: Eduardo Valentin <edubezval@gmail.com>
Acked-by: Javi Merino <javi.merino@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

include/trace/events/thermal.h

@@ -90,6 +90,7 @@ TRACE_EVENT(thermal_zone_trip,
 		show_tzt_type(__entry->trip_type))
 );
 
+#ifdef CONFIG_CPU_THERMAL
 TRACE_EVENT(thermal_power_cpu_get_power,
 	TP_PROTO(const struct cpumask *cpus, unsigned long freq, u32 *load,
 		size_t load_len, u32 dynamic_power, u32 static_power),
@@ -147,6 +148,7 @@ TRACE_EVENT(thermal_power_cpu_limit,
 		__get_bitmask(cpumask), __entry->freq, __entry->cdev_state,
 		__entry->power)
 );
+#endif /* CONFIG_CPU_THERMAL */
 
 #ifdef CONFIG_DEVFREQ_THERMAL
 TRACE_EVENT(thermal_power_devfreq_get_power,