[U-Boot] SPDX: document dual license notation

[Tom Rini]

On Tue, Oct 08, 2013 at 09:53:45PM +0200, Wolfgang Denk wrote:

> In [1] we discussed how we should deal with dual (or, more generally,
> multiple) licensed files.  Add this to  Licenses/README  so it's
> properly documented.
> 
> [1] http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/166518
> 
> Signed-off-by: Wolfgang Denk <wd at denx.de>

Applied to u-boot/master with an ammendment of "list" as per Stephen's
suggestion to the line in question, thanks!

-- 
Tom
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