tracing: Allow disabling idle traces

This change allows for enabling/disabling the idle traces by setting the
CONFIG_TRACING_IDLE config.

Signed-off-by: Krzysztof Sychla <ksychla@antmicro.com>

subsys/tracing/Kconfig

@@ -354,6 +354,12 @@ config TRACING_GPIO
 	help
 	  Enable tracing GPIO.
 
+config TRACING_IDLE
+	bool "Tracing Idle"
+	default y
+	help
+	  Enable tracing Idle state.
+
 endmenu  # Tracing Configuration
 
 endif

subsys/tracing/ctf/ctf_top.c

@@ -189,7 +189,9 @@ void sys_trace_isr_exit_to_scheduler(void)
 
 void sys_trace_idle(void)
 {
+#ifdef CONFIG_TRACING_IDLE
 	ctf_top_idle();
+#endif
 	if (IS_ENABLED(CONFIG_CPU_LOAD)) {
 		cpu_load_on_enter_idle();
 	}

subsys/tracing/sysview/sysview.c

@@ -64,7 +64,9 @@ void sys_trace_isr_exit_to_scheduler(void)
 
 void sys_trace_idle(void)
 {
+#ifdef CONFIG_TRACING_IDLE
 	SEGGER_SYSVIEW_OnIdle();
+#endif
 
 	if (IS_ENABLED(CONFIG_CPU_LOAD)) {
 		cpu_load_on_enter_idle();

subsys/tracing/test/tracing_string_format_test.c

@@ -201,12 +201,16 @@ void sys_trace_isr_exit_to_scheduler(void)
 
 void sys_trace_idle(void)
 {
+#ifdef CONFIG_TRACING_IDLE
 	TRACING_STRING("%s\n", __func__);
+#endif
 }
 
 void sys_trace_idle_exit(void)
 {
+#ifdef CONFIG_TRACING_IDLE
 	TRACING_STRING("%s\n", __func__);
+#endif
 }
 
 void sys_trace_k_condvar_broadcast_enter(struct k_condvar *condvar)