[U-Boot] test: Use single quote consistently

Wed Jan 16 02:41:41 UTC 2019

On Thu, Dec 27, 2018 at 08:11:13AM -0700, Simon Glass wrote:

> Some tests have ended up using double quotes where single quotes could be
> used. Adjust this for consistency with the rest of U-Boot's Python code.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>
> Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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