[U-Boot] lib: div64: add missing include

[Tom Rini]

On Sun, Jun 22, 2014 at 11:24:04PM +0200, Jeroen Hofstee wrote:

> Include the function its prototype to prevent the warning
> that it has no prototype.
> 
> Signed-off-by: Jeroen Hofstee <jeroen at myspectrum.nl>

Applied to u-boot/master, thanks!

-- 
Tom
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