sunxi: musb: Add id pin support

When in host mode check if there is a host cable inserted into the otg
port by checking the id pin. If there is no host cable return an error to
make usb_lowlevel_init() exit early, rather then waiting for 1 second
for a device which will never show up.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

drivers/usb/musb-new/sunxi.c

@@ -217,6 +217,11 @@ static int sunxi_musb_enable(struct musb *musb)
 			printf("A charger is plugged into the OTG: ");
 			return -ENODEV;
 		}
+		ret = sunxi_usb_phy_id_detect(0);
+		if (ret == 1) {
+			printf("No host cable detected: ");
+			return -ENODEV;
+		}
 		sunxi_usb_phy_power_on(0); /* port power on */
 	}