ppc4xx: Add initial AMCC Kilauea 405EX support

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index b8c1fdc..9ec7a5c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -304,6 +304,7 @@
 	bunbinga		PPC405EP
 	ebony			PPC440GP
 	katmai			PPC440SPe
+	kilauea			PPC405EX
 	lwmon5			PPC440EPx
 	ocotea			PPC440GX
 	p3p440			PPC440GP