ppc4xx: Add Io64 board support

Board support for the Guntermann & Drunck Io64.

Signed-off-by: Dirk Eibach <eibach@gdsys.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index c68842e..7c21981 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -150,6 +150,7 @@
 	gdppc440etx	PPC440EP/GR
 	intip		PPC460EX
 	io		PPC405EP
+	io64		PPC405EX
 	iocon		PPC405EP
 	neo		PPC405EP