add trigger pwm for ultrasonic module

source/test/pwm/main.c

@@ -22,6 +22,9 @@ int main(void)
 	drv_open(&pwm_2);
 	drv_open(&pwm_3);
 	drv_open(&pwm_4);
+
+	drv_open(&pwm5_c2);
+
 	while(1) {
 		for(unsigned int duty = 0; duty < 100; duty++) {
 			drv_ioctl(&pwm_1, IOCTL_PWM_SET_DUTY_CYCLE, (const void *)&duty);