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: Yauheni Kaliuta <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Yauheni Kaliuta