genboardscfg.py: drop python version comment

genboardscfg.py requires python 3.x since commit 3bc14098d8fb
("genboardscfg.py: Convert to Python 3").

Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/tools/genboardscfg.py b/tools/genboardscfg.py
index 24df13e..4f6382b 100755
--- a/tools/genboardscfg.py
+++ b/tools/genboardscfg.py
@@ -10,8 +10,6 @@
 Run 'tools/genboardscfg.py' to create a board database.
 
 Run 'tools/genboardscfg.py -h' for available options.
-
-Python 2.6 or later, but not Python 3.x is necessary to run this script.
 """
 
 import errno