Tools: flake8 fixes for board_list.py

Tools/scripts/board_list.py

@@ -25,6 +25,7 @@ class Board(object):
             'Sub',
         ]
 
+
 def in_blacklist(blacklist, b):
     '''return true if board b is in the blacklist, including wildcards'''
     for bl in blacklist:
@@ -32,6 +33,7 @@ def in_blacklist(blacklist, b):
             return True
     return False
 
+
 class BoardList(object):
 
     def set_hwdef_dir(self):