[U-Boot] vexpress64: let Juno wait for root device

[Tom Rini]

On Thu, May 14, 2015 at 05:38:33PM +0200, Linus Walleij wrote:

> The Juno reference design typically plugs the root FS
> on a USB stick. We need to wait a bit for the root to
> appear so tell this on the default command line.
> 
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>

Applied to u-boot/master, thanks!

-- 
Tom
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