ppc4xx: Add GDsys PowerPC 440 ETX board support.

Board support for the Guntermann & Drunck PowerPC 440 ETX module.
Based on the AMCC Yosemite board support by Stefan Roese.

Signed-off-by: Dirk Eibach <eibach@gdsys.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index fcc2043..35388df 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -132,6 +132,7 @@
 
 Dirk Eibach <eibach@gdsys.de>
 
+	gdppc440etx	PPC440EP/GR
 	neo		PPC405EP
 
 Dave Ellis <DGE@sixnetio.com>