[U-Boot] ARM: rpi: add some missing Kconfig help text

[Tom Rini]

On Fri, Apr 01, 2016 at 09:38:04PM -0600, Stephen Warren wrote:

> Add notes re: enabling the UART to the RPi 3 32-bit help text. Fully
> describe the RPi 3 64-bit board option.
> 
> Signed-off-by: Stephen Warren <swarren at wwwdotorg.org>
> Reviewed-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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