dt-bindings: treewide: Update @st.com email address to @foss.st.com

[Krzysztof Kozlowski]

On 20/10/2021 08:50, patrice.chotard at foss.st.com wrote:
> From: Patrice Chotard <patrice.chotard at foss.st.com>
> 
> Not all @st.com email address are concerned, only people who have
> a specific @foss.st.com email will see their entry updated.
> For some people, who left the company, remove their email.
> 

Please split simple address change from maintainer updates (removal,
addition).

Also would be nice to see here explained *why* are you doing this.

Best regards,
Krzysztof