[U-Boot] scripts/Makefile* Add SPDX-License-Identifier tag

[Tom Rini]

On Thu, Jan 14, 2016 at 06:24:44PM -0500, Tom Rini wrote:

> A general best practice for SPDX is that Makefiles should have an
> identifier, add these as everything else is currently covered.
> 
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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