bugfix: Application registered callback was getting skipped for persi…

…stent params

If the new bulk write callback is registered for a device/service instead of regular
callback, it was getting skipped for persistent params during initialisation.

components/esp_rainmaker/src/core/esp_rmaker_device.c

@@ -181,15 +181,19 @@ esp_err_t esp_rmaker_device_add_param(const esp_rmaker_device_t *device, const e
             /* The device callback should be invoked once with the stored value, so
              * that applications can do initialisations as required.
              */
-            if (_device->write_cb) {
+            if (_device->bulk_write_cb) {
                 /* However, the callback should be invoked, only if the parameter is not
                  * of type ESP_RMAKER_PARAM_NAME, as it has special handling internally.
                  */
                 if (!(_new_param->type && strcmp(_new_param->type, ESP_RMAKER_PARAM_NAME) == 0)) {
                     esp_rmaker_write_ctx_t ctx = {
                         .src = ESP_RMAKER_REQ_SRC_INIT,
                     };
-                    _device->write_cb(device, param, stored_val, _device->priv_data, &ctx);
+                    esp_rmaker_param_write_req_t write_req = {
+                        .param = (esp_rmaker_param_t *)param,
+                        .val = stored_val,
+                    };
+                    _device->bulk_write_cb(device, &write_req, 1, _device->priv_data, &ctx);
                 }
             }
         } else {