[U-Boot] Makefile: output migration warnings to stderr

[Tom Rini]

On Sat, Dec 15, 2018 at 11:35:54AM +1300, Chris Packham wrote:

> Output the device model migration warnings to stderr. This allows tools
> like buildman to pick them up rather than suppressing them along with
> the normal build output on stdout.
> 
> Signed-off-by: Chris Packham <judge.packham at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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