[update] ignore format check for lwip files.

.ignore_format.yml

-# files format check exclude path, please follow the instructions below to modify; 
+# files format check exclude path, please follow the instructions below to modify;
 # If you need to exclude an entire folder, add the folder path in dir_path;
 # If you need to exclude a file, add the path to the file in file_path.
 
@@ -6,4 +6,7 @@ file_path:
 - bsp/allwinner_tina/libcpu/cpu.c
 
 dir_path:
-- tools
\ No newline at end of file
+- tools
+- components/net/lwip-1.4.1
+- components/net/lwip-2.0.2
+- components/net/lwip-2.1.2
\ No newline at end of file