USB joystick support for 9xrpro (#5776)

* hid-mouse example added

* cmake script and sources fixed

* massstorage is turned off (it is still not used)

* first test (mouse instead of joystick)

* mouse renamed to joystick one more time

* it works

* refactoring

* useless files removed

* usbJoystickUpdate() moved to appropriate place

* masstorage removed for sky9x

* "keyboard" -> "joystick"

* productDescriptor changed to "SKY9X Joystick"

* attempt to fix travis

* joystick.cpp moved to FIRMWARE_TARGET_SRC

* meaningless if removed

* code style fixed for opentx/radio/src/targets/sky9x/joystick.cpp

* Revert "masstorage removed for sky9x"

This reverts commit 426726283fa9930a2742aad86b6163bd9930c446.

* opentx/radio/src/targets/sky9x/usb_driver.cpp added

* useless include removed

radio/src/tasks.cpp

@@ -180,6 +180,10 @@ TASK_FUNCTION(mixerTask)
       }
 #endif
 
+#if defined(PCBSKY9X) && !defined(SIMU)
+      usbJoystickUpdate();
+#endif
+
       DEBUG_TIMER_START(debugTimerTelemetryWakeup);
       telemetryWakeup();
       DEBUG_TIMER_STOP(debugTimerTelemetryWakeup);