esp_timer: add a function to restart timer

Timers, periodic or not, can now be restarted thanks to esp_timer_restart function.
This is done atomically, which can be used to feed a periodic timer, or simply change the period.

components/esp_system/task_wdt/task_wdt_impl_esp_timer.c

@@ -17,12 +17,6 @@
 #include "esp_timer.h"
 #include "esp_private/esp_task_wdt_impl.h"
 
-/**
- * Private API provided by esp_timer component to feed a timer without
- * the need of disabling it, removing it and inserting it manually.
- */
-esp_err_t esp_timer_feed(esp_timer_handle_t timer);
-
 /**
  * Context for the software implementation of the Task WatchDog Timer.
  * This will be passed as a parameter to public functions below. */
@@ -108,7 +102,8 @@ esp_err_t esp_task_wdt_impl_timer_feed(twdt_ctx_t obj)
     }
 
     if (ret == ESP_OK) {
-        ret = esp_timer_feed(ctx->sw_timer);
+        /* Feed the periodic timer by restarting it, specifying the same period */
+        ret = esp_timer_restart(ctx->sw_timer, ctx->period_ms * 1000);
     }
 
     return ret;