MAINTAINERS: replace Fabien by myself as Leon3 maintainer

CC: Fabien Chouteau <chouteau@adacore.com>
Signed-off-by: Clément Chigot <chigot@adacore.com>
Reviewed-by: Fabien Chouteau <chouteau@adacore.com>
Message-ID: <20240131085047.18458-10-chigot@adacore.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

MAINTAINERS

@@ -1709,7 +1709,7 @@ F: hw/rtc/sun4v-rtc.c
 F: include/hw/rtc/sun4v-rtc.h
 
 Leon3
-M: Fabien Chouteau <chouteau@adacore.com>
+M: Clément Chigot <chigot@adacore.com>
 M: Frederic Konrad <konrad.frederic@yahoo.fr>
 S: Maintained
 F: hw/sparc/leon3.c