[U-Boot] doc: fix README.standalone

[Tom Rini]

On Wed, Oct 22, 2014 at 12:41:49AM +0900, Masahiro Yamada wrote:

> Since commit fe1378a961e5 (ARM: use r9 for gd), r9 register
> is used on ARM to hold global_data.
> 
> Signed-off-by: Masahiro Yamada <yamada.m at jp.panasonic.com>
> Acked-by: Jeroen Hofstee <jeroen at myspectrum.nl>

Applied to u-boot/master, thanks!

-- 
Tom
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