pwm_out_sim: reduce verbosity

src/drivers/pwm_out_sim/PWMSim.cpp

@@ -74,21 +74,18 @@ PWMSim::set_mode(Mode mode)
 	 */
 	switch (mode) {
 	case MODE_8PWM:
-		PX4_INFO("MODE_8PWM");
 		/* multi-port as 8 PWM outs */
 		_update_rate = 400;	/* default output rate */
 		_num_outputs = 8;
 		break;
 
 	case MODE_16PWM:
-		PX4_INFO("MODE_16PWM");
 		/* multi-port as 16 PWM outs */
 		_update_rate = 400;	/* default output rate */
 		_num_outputs = 16;
 		break;
 
 	case MODE_NONE:
-		PX4_INFO("MODE_NONE");
 		/* disable servo outputs and set a very low update rate */
 		_update_rate = 10;
 		_num_outputs = 0;