[U-Boot] boards.cfg: Fix the comment for invoking tools/reformat.py from vim

[Tom Rini]

On Fri, Sep 13, 2013 at 11:43:37AM +0800, Axel Lin wrote:

> Add the missing bang (!) to execute external command, otherwise it does not
> work.
> 
> Signed-off-by: Axel Lin <axel.lin at ingics.com>

Applied to u-boot/master, thanks!

-- 
Tom
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