Projectkk2glider/issue 4086 usb and serial (#4097)

* Serial2 changes:
  * stm32 driver moved to common dir.
  * earlier start of driver (Taranis)
  * wait for free buffer time limited
USB changes:
 * Upgrade to ST USB-Host-Device_Lib_V2.2.0 (from V2.1.0) - this fixed a problem with USB serial #4086)
 * other fixes for #4086

* USB-Host-Device_Lib: renamed directory to V2.2.0 (from V2.1.0)

radio/src/opentx.cpp

@@ -2451,6 +2451,10 @@ void opentxInit(OPENTX_INIT_ARGS)
   storageReadAll();
 #endif
 
+#if defined(SERIAL2)
+  serial2Init(g_eeGeneral.serial2Mode, MODEL_TELEMETRY_PROTOCOL());
+#endif
+
 #if defined(PCBTARANIS)
   BACKLIGHT_ENABLE();
 #endif
@@ -2507,10 +2511,6 @@ void opentxInit(OPENTX_INIT_ARGS)
 #endif
   backlightOn();
 
-#if defined(SERIAL2)
-  serial2Init(g_eeGeneral.serial2Mode, MODEL_TELEMETRY_PROTOCOL());
-#endif
-
 #if defined(PCBSKY9X) && !defined(SIMU)
   init_trainer_capture();
 #endif