[Kconfig] fix wrong select type.

components/net/Kconfig

@@ -45,7 +45,6 @@ config RT_USING_SAL
             bool "Enable support AF_UNIX socket"
             default n
             default y if RT_USING_LWP
-            select LWIP_NETIF_LINK_CALLBACK
 
         if !SAL_USING_POSIX