[U-Boot] Cosmetic: Update some info in the README "arch" section.

[Tom Rini]

On Sun, Sep 15, 2013 at 06:34:15PM -0400, Robert P. J. Day wrote:

> Tidy up, reorder, and add newer info to the arch/ directory subsection
> of the README file.
> 
> Signed-off-by: Robert P. J. Day <rpjday at crashcourse.ca>

Applied to u-boot/master, thanks!

-- 
Tom
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