MAINTAINERS: add myself as MIPS guest cores co-maintainer

Add myself to the maintainer list for MIPS guest cores and update the status
from "Odd Fixes" to "Maintained".

Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
Acked-by: Aurelien Jarno <aurelien@aurel32.net>
Message-id: 1413459487-13658-1-git-send-email-leon.alrae@imgtec.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

MAINTAINERS

@@ -100,7 +100,8 @@ F: hw/microblaze/
 
 MIPS
 M: Aurelien Jarno <aurelien@aurel32.net>
-S: Odd Fixes
+M: Leon Alrae <leon.alrae@imgtec.com>
+S: Maintained
 F: target-mips/
 F: hw/mips/