feat(esp8266): Add WIFI socket and async APIs

1. add section to linking file

components/esp8266/include/net/sockio.h

@@ -0,0 +1,46 @@
+// Copyright 2018 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 _SOCKIO_H
+#define _SOCKIO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* espressif specific socket ioctls */
+#define SIOESPSTART         0x5500              /* start of espressif specific code */
+
+/* routing table calls. */
+#define SIOCADDRT           0x890B              /* add routing table entry	*/
+#define SIOCDELRT           0x890C              /* delete routing table entry	*/
+#define SIOCRTMSG           0x890D              /* call to routing system	*/
+
+/* socket configuration controls. */
+#define SIOCGIFADDR         0x8915              /* get PA address		*/
+#define SIOCSIFADDR         0x8916              /* set PA address		*/
+#define SIOCGIFBRDADDR      0x8919              /* get broadcast PA address	*/
+#define SIOCSIFBRDADDR      0x891a              /* set broadcast PA address	*/
+#define SIOCGIFNETMASK      0x891b              /* get network PA mask		*/
+#define SIOCSIFNETMASK      0x891c              /* set network PA mask		*/
+#define SIOCSIFHWADDR       0x8924              /* set hardware address 	*/
+#define SIOCGIFHWADDR       0x8927              /* Get hardware address		*/
+#define SIOCGIFINDEX        0x8933              /* name -> if_index mapping	*/
+#define SIOGIFINDEX         SIOCGIFINDEX        /* misprint compatibility :-)	*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SOCKIO_H */