Convert DM9000 driver for CONFIG_NET_MULTI

All drivers need to be converted to CONFIG_NET_MULTI.
This patch converts the dm9000 driver.

Signed-off-by: Thomas Smits <ts.smits@gmail.com>
Signed-off-by: Remy Bohmer <linux@bohmer.net>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/include/configs/at91sam9261ek.h b/include/configs/at91sam9261ek.h
index 4f6b640..83e05b3 100644
--- a/include/configs/at91sam9261ek.h
+++ b/include/configs/at91sam9261ek.h
@@ -131,6 +131,7 @@
 #define CONFIG_SYS_NO_FLASH			1
 
 /* Ethernet */
+#define CONFIG_NET_MULTI		1
 #define CONFIG_DRIVER_DM9000		1
 #define CONFIG_DM9000_BASE		0x30000000
 #define DM9000_IO			CONFIG_DM9000_BASE