[U-Boot] doc: remove duplicate text in README.gpt

[Tom Rini]

On Mon, Sep 04, 2017 at 06:19:04PM -0700, alison at peloton-tech.com wrote:

> From: Alison Chaiken <alison at she-devel.com>
> 
> Signed-off-by: Alison Chaiken <alison at she-devel.com>

Applied to u-boot/master, thanks!

-- 
Tom
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