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/Makefile b/Makefile
index 8c73586..f9c7c14 100644
--- a/Makefile
+++ b/Makefile
@@ -1325,6 +1325,9 @@
 G2000_config:	unconfig
 	@$(MKCONFIG) $(@:_config=) ppc ppc4xx g2000
 
+gdppc440etx_config:	unconfig
+	@$(MKCONFIG) $(@:_config=) ppc ppc4xx gdppc440etx gdsys
+
 hcu4_config:	unconfig
 	@mkdir -p $(obj)board/netstal/common
 	@$(MKCONFIG) $(@:_config=) ppc ppc4xx hcu4 netstal