Enable CONFIG_NET_MULTI on all remaining PPC4xx boards

All in-tree PPC4xx boards now use CONFIG_NET_MULTI

Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/EXBITGEN.h b/include/configs/EXBITGEN.h
index 4729464..4d08243 100644
--- a/include/configs/EXBITGEN.h
+++ b/include/configs/EXBITGEN.h
@@ -81,6 +81,7 @@
 
 #define CONFIG_MII		1	/* MII PHY management		*/
 #define CONFIG_PHY_ADDR		0	/* PHY address			*/
+#define CONFIG_NET_MULTI
 
 
 /*