[U-Boot] fixing typo error in README file. CPU15 -> CP15

[Tom Rini]

On Wed, Jul 20, 2016 at 10:56:12PM +0900, yeongjun Kim wrote:

> It looks typo error. 
> Not CPU15, CP15(CoProcessor15)
> 	
> Signed-off-by: yeongjun Kim <iam.yeongjunkim at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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