[link] add public OT API otLinkResetCounters to reset MAC counters (#4286)

include/openthread/link.h

@@ -751,6 +751,14 @@ int8_t otLinkConvertLinkQualityToRss(otInstance *aInstance, uint8_t aLinkQuality
  */
 const otMacCounters *otLinkGetCounters(otInstance *aInstance);
 
+/**
+ * Reset the MAC layer counters.
+ *
+ * @param[in]  aInstance A pointer to an OpenThread instance.
+ *
+ */
+void otLinkResetCounters(otInstance *aInstance);
+
 /**
  * This function pointer is called when an IEEE 802.15.4 frame is received.
  *

src/core/api/link_api.cpp

@@ -371,6 +371,13 @@ const otMacCounters *otLinkGetCounters(otInstance *aInstance)
     return &instance.Get<Mac::Mac>().GetCounters();
 }
 
+void otLinkResetCounters(otInstance *aInstance)
+{
+    Instance &instance = *static_cast<Instance *>(aInstance);
+
+    instance.Get<Mac::Mac>().ResetCounters();
+}
+
 otError otLinkActiveScan(otInstance *             aInstance,
                          uint32_t                 aScanChannels,
                          uint16_t                 aScanDuration,