[U-Boot] travis: Bump ARC tools to arc-2018.09

[Tom Rini]

On Mon, Dec 03, 2018 at 05:09:13PM +0300, Alexey Brodkin wrote:

> Build tested in Travis, see:
> https://travis-ci.org/abrodkin/u-boot/jobs/462808237
> 
> Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>

Applied to u-boot/master, thanks!

-- 
Tom
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