dm355/pm9261: add missing CONFIG_NET_MULTI

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/include/configs/davinci_dm355evm.h b/include/configs/davinci_dm355evm.h
index 9a7df08..c35f5c9 100644
--- a/include/configs/davinci_dm355evm.h
+++ b/include/configs/davinci_dm355evm.h
@@ -57,6 +57,7 @@
 #define CONFIG_DM9000_BASE		0x04014000
 #define DM9000_IO			CONFIG_DM9000_BASE
 #define DM9000_DATA			(CONFIG_DM9000_BASE + 2)
+#define CONFIG_NET_MULTI
 
 /* I2C */
 #define CONFIG_HARD_I2C