[U-Boot] tools/genboardscfg.py: remove bogus import subprocess

[Tom Rini]

On Sun, May 22, 2016 at 03:16:47PM +0900, Masahiro Yamada wrote:

> Since f6c8f38ec601 ("tools/genboardscfg.py: improve performance more
> with Kconfiglib"), this tool does not use the subprocess module.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>

Applied to u-boot/master, thanks!

-- 
Tom
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