[U-Boot] .travis.yml: Fix typo in sun7i job description

Mon Sep 10 21:49:28 UTC 2018

On Sat, Sep 08, 2018 at 12:53:18AM +0300, Tuomas Tynkkynen wrote:

> 'builman' -> 'buildman'
> 
> Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen at iki.fi>

Applied to u-boot/master, thanks!

-- 
Tom
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