ppc4xx: Add initial Zeus (PPC405EP) board support

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6dd43f8..853afeb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -293,6 +293,7 @@
 	walnut			PPC405GP
 	yellowstone		PPC440GR
 	yosemite		PPC440EP
+	zeus			PPC405EP
 
 	P3M750			PPC750FX/GX/GL