MAINTAINERS: add myself for leon3

Reviewed-by: Fabien Chouteau <chouteau@adacore.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: KONRAD Frederic <frederic.konrad@adacore.com>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

MAINTAINERS

@@ -1158,6 +1158,7 @@ F: include/hw/timer/sun4v-rtc.h
 
 Leon3
 M: Fabien Chouteau <chouteau@adacore.com>
+M: KONRAD Frederic <frederic.konrad@adacore.com>
 S: Maintained
 F: hw/sparc/leon3.c
 F: hw/*/grlib*