[U-Boot] pci: Add comment to mention difference in DEVFN usage in U-Boot vs Linux

[Tom Rini]

On Mon, Feb 11, 2019 at 08:43:25AM +0100, Stefan Roese wrote:

> This patch adds a comment to the header with the PCI_foo macros related
> to DEVFN to explain the difference in U-Boot vs Linux.
> 
> Signed-off-by: Stefan Roese <sr at denx.de>
> Cc: Simon Glass <sjg at chromium.org>
> Cc: Bin Meng <bmeng.cn at gmail.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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