ppc4xx: Add Io and IoCon 405EP board support

Board support for the Guntermann & Drunck CATCenter Io.
Board support for the Guntermann & Drunck IoCon.

Signed-off-by: Dirk Eibach <eibach@gdsys.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index b0da631..9258cb1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -144,6 +144,8 @@
 	dlvision        PPC405EP
 	gdppc440etx	PPC440EP/GR
 	intip		PPC460EX
+	io		PPC405EP
+	iocon		PPC405EP
 	neo		PPC405EP
 
 Dave Ellis <DGE@sixnetio.com>