[U-Boot] clang: Update documentation

[Tom Rini]

On Sun, Apr 22, 2018 at 07:15:03PM -0400, Tom Rini wrote:

> As of clang-5.0, things have changed a bit.  First, we cannot
> automatically guess -target values as if we do not pass one with CC then
> cc-option will fail.  Second, to disable movt/movw relocations the
> argument has become -mno-movt.
> 
> Related to the target part, we cannot use arm-none-eabi as that ends up
> being too generic of an ARM target for things like say rpi_3_32b to
> work.
> 
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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