Fix otSendMacDataRequest API (#1521)

* Fix otSendMacDataRequest API

* Add otSendMacDataRequest declaration to API headers
* Move otSendMacDataRequest from thread to link API

* Update otSendMacDataRequest to otLinkSendDataRequest

examples/drivers/windows/otApi/otApi.cpp

@@ -1366,7 +1366,7 @@ otIsDiscoverInProgress(
 OTAPI 
 ThreadError
 OTCALL
-otSendMacDataRequest(
+otLinkSendDataRequest(
     _In_ otInstance *aInstance
     )
 {

src/core/api/link_api.cpp

@@ -124,6 +124,11 @@ void otLinkSetPollPeriod(otInstance *aInstance, uint32_t aPollPeriod)
     aInstance->mThreadNetif.GetMeshForwarder().SetAssignPollPeriod(aPollPeriod);
 }
 
+ThreadError otLinkSendDataRequest(otInstance *aInstance)
+{
+    return aInstance->mThreadNetif.GetMeshForwarder().SendMacDataRequest();
+}
+
 otShortAddress otLinkGetShortAddress(otInstance *aInstance)
 {
     return aInstance->mThreadNetif.GetMac().GetShortAddress();

src/core/api/thread_api.cpp

@@ -648,11 +648,6 @@ bool otThreadIsDiscoverInProgress(otInstance *aInstance)
     return aInstance->mThreadNetif.GetMle().IsDiscoverInProgress();
 }
 
-ThreadError otSendMacDataRequest(otInstance *aInstance)
-{
-    return aInstance->mThreadNetif.GetMeshForwarder().SendMacDataRequest();
-}
-
 #ifdef __cplusplus
 }  // extern "C"
 #endif