MAINTAINERS: Update email address for Christophe Leroy

MAINTAINERS: Update email address for Christophe Leroy

My address at csgroup.eu is redirected to the new one at
cs-soprasteria.com which is a Professionnal Microsoft account without
SMTP gateway. We still have the SMTP gateway for csgroup.eu but it is
not maintained anymore and might stop working at anytime. In addition
the DKIM signature is not performed allthough the domain has DMARC
set up.

Switch to kernel.org email address and add entries in mailmap.

Link: https://lore.kernel.org/r/d9b6758297d7dcddf79feb4459ceaedd7d6f1f2e.1764155757.git.chleroy@kernel.org
Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>