[U-Boot] Avoid non-portable sed construct

[Tom Rini]

On Sun, Jan 08, 2017 at 07:11:27PM +0100, Mark Kettenis wrote:

> Using \n in a substitution is a GNU extension.  Use the 'G" command instead
> to insert the desired line.
> 
> Signed-off-by: Mark Kettenis <kettenis at openbsd.org>

Applied to u-boot/master, thanks!

-- 
Tom
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