[U-Boot] Licenses/README: Update some style and add explicit license to the document

[Tom Rini]

On Tue, May 08, 2018 at 11:34:36AM -0400, Tom Rini wrote:

> - Add an SPDX license tag to the file, saying it's GPL-2.0.
> - From the Linux Kernel v4.17-rc4, import the "License identifier
>   syntax" section as-is from Documentation/process/license-rules.rst
>   and then change it to be clearer about examples from the Linux Kernel
>   vs examples found in U-Boot, and when we're talking about U-Boot.
> 
> Signed-off-by: Tom Rini <trini at konsulko.com>

Applied to u-boot/master, thanks!

-- 
Tom
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