[U-Boot] PCI: Document pciauto_region_allocate()

[Tom Rini]

On Mon, May 14, 2018 at 11:50:05PM +0300, Tuomas Tynkkynen wrote:

> Add a doc comment for pciauto_region_allocate().
> 
> Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen at iki.fi>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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