[U-Boot] doc: Updated README.ext4

[Tom Rini]

On Wed, Apr 13, 2016 at 06:30:16PM -0400, Robert P. J. Day wrote:

> Clean up the ext4 README file.
> 
> Signed-off-by: Robert P. J. Day <rpjday at crashcourse.ca>

Applied to u-boot/master, thanks!

-- 
Tom
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