Add MAINTAINERS entry for leon3

Signed-off-by: Fabien Chouteau <chouteau@adacore.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6d864c1..61f8b45 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -398,6 +398,12 @@
 S: Maintained
 F: hw/sun4u.c
 
+Leon3
+M: Fabien Chouteau <chouteau@adacore.com>
+S: Maintained
+F: hw/leon3.c
+F: hw/grlib*
+
 S390 Machines
 -------------
 S390 Virtio