[net] adjust folder structure (#5587)

* [net] adjust folder structure
- 将lwip相关的文件夹，移入lwip文件夹
- Kconfig 分散到at netdev lwip sal文件夹中，使用menuconfig代替menu

1 files changed, 0 insertions, 36 deletions

diff --git a/components/net/sal_socket/include/socket/netdb.h b/components/net/sal_socket/include/socket/netdb.h
deleted file mode 100644
index 8394fddea5..0000000000
--- a/components/net/sal_socket/include/socket/netdb.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2015-02-17     Bernard      First version
- * 2018-05-24     ChenYong     Add socket abstraction layer
- */
-
-#ifndef NETDB_H__
-#define NETDB_H__
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include <stddef.h>
-#include <sal_netdb.h>
-
-struct hostent *gethostbyname(const char *name);
-
-int gethostbyname_r(const char *name, struct hostent *ret, char *buf,
-                size_t buflen, struct hostent **result, int *h_errnop);
-void freeaddrinfo(struct addrinfo *ai);
-int getaddrinfo(const char *nodename,
-       const char *servname,
-       const struct addrinfo *hints,
-       struct addrinfo **res);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif