[U-Boot] Makefile: fix the typo error for mrproper

[Tom Rini]

On Mon, Dec 16, 2013 at 03:27:23PM +0800, Bo Shen wrote:

> Fix the typo error for mrproper from mkproper.
> 
> Signed-off-by: Bo Shen <voice.shen at atmel.com>
> Acked-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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