net: davince: add missing include

Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
index 439f8ae..08bc1af 100644
--- a/drivers/net/davinci_emac.c
+++ b/drivers/net/davinci_emac.c
@@ -27,6 +27,7 @@
 #include <net.h>
 #include <miiphy.h>
 #include <malloc.h>
+#include <netdev.h>
 #include <linux/compiler.h>
 #include <asm/arch/emac_defs.h>
 #include <asm/io.h>