[U-Boot] Fix variable documented in README.distro for PXE address.

[Tom Rini]

On Mon, Feb 08, 2016 at 07:55:31PM -0800, Vagrant Cascadian wrote:

> Fixes typo of pxe_addr_r with pxefile_addr_r.
> 
> Signed-off-by: Vagrant Cascadian <vagrant at debian.org>
> Reviewed-by: Stephen Warren <swarren at wwwdotorg.org>

Applied to u-boot/master, thanks!

-- 
Tom
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