[U-Boot] dm: Update README.txt to clarify device tree usage

[Tom Rini]

On Fri, Aug 31, 2018 at 11:59:11AM -0400, Tom Rini wrote:

> In the section about Device Trees add a paragraph at the end that
> clarifies how we decide of a tree is valid or not.  We say that all
> bindings must either be in the specification (link provided) or in our
> device-tree-bindings directory.  We say that most of these come from the
> Linux Kernel and as such some design decisions are made for us already,
> but that in most cases we wish to retain compatibility.
> 
> Cc: Simon Glass <sjg at chromium.org>
> Cc: Bin Meng <bmeng.cn at gmail.com>
> Signed-off-by: Tom Rini <trini at konsulko.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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