[v2] travis: Install pyelftools via pip

[Tom Rini]

On Mon, Jul 27, 2020 at 02:42:59PM -0400, Tom Rini wrote:

> With the migration to python3 for all of our tests, we need to install
> pyelftools via pip now rather than the system tools as they will
> otherwise not be present in our virtualenv.
> 
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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