ARM: imx7s-warp: enable USB gadget ethernet

Enable USB gadget ethernet by default to have networking capabilities.

Tested using DHCP and TFTP to transfer kernel, DT, ramdisk.

Cc: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
diff --git a/board/warp7/warp7.c b/board/warp7/warp7.c
index da9afb4..df8e9da 100644
--- a/board/warp7/warp7.c
+++ b/board/warp7/warp7.c
@@ -19,6 +19,7 @@
 #include <mmc.h>
 #include <asm/arch/crm_regs.h>
 #include <usb.h>
+#include <netdev.h>
 #include <power/pmic.h>
 #include <power/pfuze3000_pmic.h>
 #include "../freescale/common/pfuze.h"
@@ -138,6 +139,19 @@
 }
 #endif
 
+int board_eth_init(bd_t *bis)
+{
+	int ret = 0;
+
+#ifdef CONFIG_USB_ETHER
+	ret = usb_eth_initialize(bis);
+	if (ret < 0)
+		printf("Error %d registering USB ether.\n", ret);
+#endif
+
+	return ret;
+}
+
 int board_init(void)
 {
 	/* address of boot parameters */