[U-Boot] MAINTAINERS: Update stm32mp entry

[Tom Rini]

On Thu, Nov 08, 2018 at 05:52:21PM +0100, Patrick Delaunay wrote:

> Add mailing list for stm32mp architecture and board.
> 
> Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>

Applied to u-boot/master, thanks!

-- 
Tom
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