[U-Boot] README: fix typo in 'currently'

[Tom Rini]

On Sat, Apr 25, 2015 at 06:53:10PM -0300, Fabio Estevam wrote:

> From: Fabio Estevam <fabio.estevam at freescale.com>
> 
> Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
> Reviewed-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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