genboardscfg.py: drop python version comment

genboardscfg.py requires python 3.x since commit 3bc14098
("genboardscfg.py: Convert to Python 3").

Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NBaruch Siach <baruch@tkos.co.il>
Acked-by: NMasahiro Yamada <yamada.masahiro@socionext.com>

tools/genboardscfg.py

@@ -10,8 +10,6 @@ Converter from Kconfig and MAINTAINERS to a board database.
 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