[lwip] integrate lwip porting layer (#5606)

* [lwip] integrate lwip porting layer

* Lwip 通用文件梳理 (#2)

* [modify] extract the common files for different version about lwip.

* [update] the initialization logic of lwIP.

* 整理源码结构

* ethernetif 头文件 ""改为<>

* 整理代码

* add macro definition "RT_USING_DEVICE_IPC".

* [update] mandatory selected "RT_USING_DEVICE_IPC".

* [modify] compile error for lost "lwip/init.h"

Co-authored-by: xiangxistu <52819708+xiangxistu@users.noreply.github.com>
Co-authored-by: liuxianliang <liuxianliang@rt-thread.com>

components/net/at/SConscript

@@ -13,13 +13,13 @@ if GetDepend(['AT_USING_SERVER']):
     src/at_server.c
     src/at_base_cmd.c
     ''')
-    
+
 if GetDepend(['AT_USING_CLIENT']):
     src += Glob('src/at_client.c')
-    
+
 if GetDepend(['AT_USING_SOCKET']):
     src += Glob('at_socket/*.c')
-    path += [cwd + '/at_socket']   
+    path += [cwd + '/at_socket']
 
 group = DefineGroup('AT', src, depend = ['RT_USING_AT'], CPPPATH = path)