[U-Boot] [U-Boot,3/5] Add comments for debug() and pr_fmt

[Tom Rini]

On Sun, Jun 19, 2016 at 07:43:03PM -0600, Simon Glass wrote:

> Add a note to each of these so it is more obvious how they work.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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