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/board/gdsys/common/Makefile b/board/gdsys/common/Makefile
index 2868cc8..05dd65d 100644
--- a/board/gdsys/common/Makefile
+++ b/board/gdsys/common/Makefile
@@ -30,6 +30,7 @@
 LIB	= $(obj)lib$(VENDOR).o
 
 COBJS-$(CONFIG_IO) += miiphybb.o
+COBJS-$(CONFIG_IO64) += miiphybb.o
 COBJS-$(CONFIG_IOCON) += osd.o
 COBJS-$(CONFIG_DLVISION_10G) += osd.o