add utility function to check if TCC is enabled

watch-library/watch/watch.c

@@ -38,3 +38,7 @@ void SYSTEM_Handler(void) {
 bool watch_is_battery_low(void) {
     return battery_is_low;
 }
+
+bool watch_is_buzzer_or_led_enabled(void){
+    return hri_mclk_get_APBCMASK_TCC0_bit(MCLK);
+}

watch-library/watch/watch.h

@@ -73,4 +73,11 @@
   */
 bool watch_is_battery_low(void);
 
+/** @brief Returns true if either the buzzer or the LED driver is enabled.
+  * @details Both the buzzer and the LED use the TCC peripheral to drive their behavior. This function returns true if that
+  *          peripheral is enabled. You can use this function to determine whether you need to call the watch_disable_leds or
+  *          or watch_enable_buzzer functions before using these peripherals.
+  */
+bool watch_is_buzzer_or_led_enabled(void);
+
 #endif /* WATCH_H_ */