tools: add readability/fn_size to filter

PR-URL: #54744
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

tools/cpplint.py

@@ -397,7 +397,10 @@
 # flag. By default all errors are on, so only add here categories that should be
 # off by default (i.e., categories that must be enabled by the --filter= flags).
 # All entries here should start with a '-' or '+', as in the --filter= flag.
-_DEFAULT_FILTERS = ['-build/include_alpha']
+_DEFAULT_FILTERS = [
+    '-build/include_alpha',
+    '-readability/fn_size',
+    ]
 
 # The default list of categories suppressed for C (not C++) files.
 _DEFAULT_C_SUPPRESSED_CATEGORIES = [