musb: set MUSB speed based on CONFIG

Do not config MUSB to highspeed mode if CONFIG_USB_GADGET_DUALSPEED
is not set, in which case Ether gadget only operates in fullspeed.

Reviewed-by: Tom Rini <trini@ti.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
diff --git a/drivers/usb/musb-new/musb_uboot.c b/drivers/usb/musb-new/musb_uboot.c
index 762cbc1..15d2ec0 100644
--- a/drivers/usb/musb-new/musb_uboot.c
+++ b/drivers/usb/musb-new/musb_uboot.c
@@ -174,7 +174,7 @@
 {
 	int ret;
 
-	if (!driver || driver->speed < USB_SPEED_HIGH || !driver->bind ||
+	if (!driver || driver->speed < USB_SPEED_FULL || !driver->bind ||
 	    !driver->setup) {
 		printf("bad parameter.\n");
 		return -EINVAL;