[U-Boot] dm: add missing includes

[Tom Rini]

On Wed, Jun 25, 2014 at 09:57:45PM +0200, Jeroen Hofstee wrote:

> lists.c / root.c do not include their own header and they
> could potentially implement a different function. Therefore
> actually include the headers.
> 
> cc: sjg at chromium.org
> Signed-off-by: Jeroen Hofstee <jeroen at myspectrum.nl>
> Acked-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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