[U-Boot] GPIO: Correct doc typo "confguration" -> "configuration"

Thu Feb 9 03:03:15 UTC 2017

On Mon, Feb 06, 2017 at 07:11:41AM -0500, Robert P. J. Day wrote:

> Signed-off-by: Robert P. J. Day <rpjday at crashcourse.ca>

Applied to u-boot/master, thanks!

-- 
Tom
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