[U-Boot] README: update mailing list url

Tom Rini
2017-11-21T13:06:11Z

On Tue, Nov 14, 2017 at 10:56:42PM -0800, S. Lockwood-Childs wrote:

> Old url currently returns 403; modify to url that actually works
> with current state of the list server
>
> Signed-off-by: S. Lockwood-Childs <sjl@vctlabs.com>

Applied to u-boot/master, thanks!

--
Tom
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