esp_netif: Add CONFIG_LWIP_DHCPS to sperate the code

components/lwip/CMakeLists.txt

@@ -7,7 +7,6 @@ set(include_dirs
     )
 
 set(srcs
-    "apps/dhcpserver/dhcpserver.c"
     "apps/sntp/sntp.c"
     "lwip/src/api/api_lib.c"
     "lwip/src/api/api_msg.c"
@@ -145,6 +144,10 @@ if(CONFIG_LWIP_ICMP)
         "apps/ping/ping_sock.c")
 endif()
 
+if(CONFIG_LWIP_DHCPS)
+    list(APPEND srcs "apps/dhcpserver/dhcpserver.c")
+endif()
+
 idf_component_register(SRCS "${srcs}"
                     INCLUDE_DIRS "${include_dirs}"
                     LDFRAGMENTS linker.lf