drivers: usb: gadget: ether/rndis: convert driver to adopt device driver model

Adopt usb ether gadget and rndis driver to adopt driver model

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 40839d8..261ed12 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -112,6 +112,10 @@
 config G_DNL_PRODUCT_NUM
 	hex "Product ID of USB device"
 
+config USBNET_DEVADDR
+	string "USB Gadget Ethernet device mac address"
+	default "de:ad:be:ef:00:01"
+
 endif # USB_GADGET_DOWNLOAD
 
 endif # USB_GADGET