net: sunxi_emac: Remove non-DM_ETH code

As DM_ETH is required for all network drivers, it's now safe to
remove the non-DM_ETH support code.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/net/sunxi_emac.c b/drivers/net/sunxi_emac.c
index 8625e49..ad9e1ab 100644
--- a/drivers/net/sunxi_emac.c
+++ b/drivers/net/sunxi_emac.c
@@ -164,9 +164,7 @@
 	struct mii_dev *bus;
 	struct phy_device *phydev;
 	int link_printed;
-#ifdef CONFIG_DM_ETH
 	uchar rx_buf[EMAC_RX_BUFSIZE];
-#endif
 };
 
 struct emac_rxhdr {