CDC NCM function

[benedekkupper]

Porting over the existing implementation, likely with a redesign of the application interface. Hooking into zephyr's network stack would be a good validation target, and easy to get started with, since the USB device is ported already.

[benedekkupper]

Keep this in mind:

When NCM is used with hosts like Windows PC, it is observed that there are
multiple NTB's contained in one usb request giveback. Since the driver
unwraps the obtained request data assuming only one NTB is present, we loose
the subsequent NTB's present resulting in data loss.

Fix this by checking the parsed block length with the obtained data length
in usb request and continue parsing after the last byte of current NTB.