Add default frequency to loudspeaker set

stm-firmware/include/reflow-controller/digio.h

@@ -59,6 +59,7 @@ int led_get(uint8_t num);
 #define LOUDSPEAKER_RCC_MASK RCC_AHB1ENR_GPIOBEN
 #define LOUDSPEAKER_PIN 1
 #define LOUDSPEAKER_MULTIFREQ 1
+#define LOUDSPEAKER_MULTIFREQ_DEFAULT 9
 
 void loudspeaker_setup(void);
 void loudspeaker_set(uint16_t val);