Moved initialization of NATSEMI Ethernet controller to board_eth_init()

Affected boards:
	a3000

Removed initialization of the driver from net/eth.c

Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/drivers/net/natsemi.c b/drivers/net/natsemi.c
index 4aee048..ff8d2d7 100644
--- a/drivers/net/natsemi.c
+++ b/drivers/net/natsemi.c
@@ -53,6 +53,7 @@
 #include <common.h>
 #include <malloc.h>
 #include <net.h>
+#include <netdev.h>
 #include <asm/io.h>
 #include <pci.h>