feat(esp8266): Add feature to set/get WIFI rx data ram type

Use iram to upload pbuf.

components/esp8266/include/internal/esp_wifi_internal.h

@@ -0,0 +1,45 @@
+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP_WIFI_INTERNAL_H
+#define _ESP_WIFI_INTERNAL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+    WIFI_RX_PBUF_IRAM,   /** save rx buffer to iram and upload to tcpip*/
+    WIFI_RX_PBUF_DRAM,   /** save rx buffer to dram and upload to tcpip */
+} wifi_rx_pbuf_mem_type_t;
+
+/**
+  * @brief     Set WIFI received TCP/IP data cache ram type
+  *
+  * @param     type if use dram
+  */
+void esp_wifi_set_rx_pbuf_mem_type(wifi_rx_pbuf_mem_type_t type);
+
+/**
+  * @brief     get WIFI received TCP/IP data cache ram type
+  *
+  * @return    true if use dram or false
+  */
+wifi_rx_pbuf_mem_type_t esp_wifi_get_rx_pbuf_mem_type(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ESP_WIFI_INTERNAL_H */