[U-Boot] arm: clang: Update support slightly

[Tom Rini]

On Wed, Mar 16, 2016 at 07:55:55PM -0400, Tom Rini wrote:

> - Move most of the flags required into LLVM_RELFLAGS to test at build
>   time instead of requiring them to be passed in.
> - Update doc/README.clang to reflect this
> - Switch to rpi_2 as the example as it's closer to working out of the
>   box than rpi is.
> 
> 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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