[Taranis] USB deconnection fix

[Taranis / sky9x] Less maths for audio (no more sin)

src/simpgmspace.cpp

@@ -591,6 +591,7 @@ void lcdRefresh()
 }
 
 #if defined(PCBTARANIS)
+void usbStart() { }
 ErrorStatus RTC_SetTime(uint32_t RTC_Format, RTC_TimeTypeDef* RTC_TimeStruct) { return SUCCESS; }
 ErrorStatus RTC_SetDate(uint32_t RTC_Format, RTC_DateTypeDef* RTC_DateStruct) { return SUCCESS; }
 void RTC_GetTime(uint32_t RTC_Format, RTC_TimeTypeDef* RTC_TimeStruct) { }