usb: dfu: fix boards wo USB cable detection

Former usb_cable_connected() patch broke compilation of boards which do
not support this feature.

I've renamed usb_cable_connected() to g_dnl_usb_cable_connected() and added
its default implementation to gadget downloader driver code. There's
only one driver of this kind and it's unlikely there'll be another, so
there's no point in keeping it in /common.

Previously this function was declared in usb.h. I've moved it, since
it's more appropriate to keep it in g_dnl.h - usb.h seems to be intended
for USB host implementation.

Existing code, confronted with default -EOPNOTSUPP return value,
continues as if the cable was connected.

CONFIG_USB_CABLE_CHECK was removed.

Change-Id: Ib9198621adee2811b391c64512f14646cefd0369
Signed-off-by: Mateusz Zalega <m.zalega@samsung.com>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Lukasz Majewski <l.majewski@samsung.com>
diff --git a/board/samsung/trats/trats.c b/board/samsung/trats/trats.c
index 7c79e7b..ab0ad1d 100644
--- a/board/samsung/trats/trats.c
+++ b/board/samsung/trats/trats.c
@@ -430,8 +430,7 @@
 	return s3c_udc_probe(&s5pc210_otg_data);
 }
 
-#ifdef CONFIG_USB_CABLE_CHECK
-int usb_cable_connected(void)
+int g_dnl_board_usb_cable_connected(void)
 {
 	struct pmic *muic = pmic_get("MAX8997_MUIC");
 	if (!muic)
@@ -440,7 +439,6 @@
 	return !!muic->chrg->chrg_type(muic);
 }
 #endif
-#endif
 
 static void pmic_reset(void)
 {