[U-Boot] README: update mailing list url

Tue Nov 21 13:06:11 UTC 2017

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 at vctlabs.com>

Applied to u-boot/master, thanks!

-- 
Tom
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