Trim HSI until time sync packets are received

Core/Inc/TimeSync.h

@@ -1,6 +1,8 @@
 #ifndef INC_TIME_SYNC_H_
 #define INC_TIME_SYNC_H_
 
+#include <stdint.h>
+
 #define TARGET_FREQ 16000000    // Hz
 #define TRIM_FREQ 48000         // Hz
 #define TIME_SYNC_INTERVAL 1000 // ms
@@ -9,5 +11,7 @@
 #define STARTUP_TIME_SYNC_TIME 5000 // ms
 
 void time_sync_handle_frame();
+void time_sync_startup_check();
+void trim_hsi(int32_t delta);
 
 #endif // INC_TIME_SYNC_H_