[U-Boot] doc/README.clang: Document sandbox instructions

[Tom Rini]

On Wed, Mar 16, 2016 at 08:40:20PM -0400, Tom Rini wrote:

> It is possible to compile and run the sandbox target with clang
> currently, so document that as well.
> 
> Cc: Jeroen Hofstee <jeroen at myspectrum.nl>
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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