remove the ignore

bsp/nrf51822/.ignore_format.yml

@@ -1,10 +0,0 @@
-# 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.
-
-file_path:
-
-dir_path:
-- Libraries
-- applications
-- drivers