usb: gadget: Move USBNET_HOST_ADDR to Kconfig

While the USB Ethernet device address is already defined in Kconfig, the
host address isn't. Convert it.

Reviewed-by: Ɓukasz Majewski <lukma@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 6dc9d17..510efd6 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -128,4 +128,11 @@
 	  Ethernet MAC address of the device-side (ie. local board's) MAC
 	  address of the usb_ether interface
 
+config USBNET_HOST_ADDR
+	string "USB Gadget Ethernet host mac address"
+	default "de:ad:be:ef:00:00"
+	help
+	  Ethernet MAC address of the host-side (ie. remote device's) MAC
+	  address of the usb_ether interface
+
 endif # USB_GADGET