freertos: update module handles to struct type

This commit updates the handles for the timer, task and event_group
modules to struct type. This matches upstream freertos source.

Signed-off-by: Sudeep Mohanty <sudeep.mohanty@espressif.com>

components/freertos/FreeRTOS-Kernel/include/freertos/timers.h

@@ -75,11 +75,8 @@
  * (for example, xTimerStart(), xTimerReset(), etc.).
  */
 struct tmrTimerControl; /* The old naming convention is used to prevent breaking kernel aware debuggers. */
-#ifdef ESP_PLATFORM // IDF-3768
-typedef void* TimerHandle_t;
-#else
 typedef struct tmrTimerControl * TimerHandle_t;
-#endif // ESP_PLATFORM
+
 /*
  * Defines the prototype to which timer callback functions must conform.
  */