usb: gadget: f_ncm.c added

Initial submittion of NCM link function driver.

The driver's logic is based on f_ecm driver and does not
use most of the NCM advantages like frame grouping and alignment.
Signed-off-by: NYauheni Kaliuta <yauheni.kaliuta@nokia.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/u_ether.h

@@ -107,6 +107,7 @@ static inline bool can_support_ecm(struct usb_gadget *gadget)
 /* each configuration may bind one instance of an ethernet link */
 int geth_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
 int ecm_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
+int ncm_bind_config(struct usb_configuration *c, u8 ethaddr[ETH_ALEN]);
 int eem_bind_config(struct usb_configuration *c);
 
 #ifdef USB_ETH_RNDIS