feat(class/cdc/usbd_ncm): 添加usb device ncm功能 (#433)HEADmaster

* 添加usb device ncm功能

* fix(class/cdc/usbd_ncm): address review findings

- fix compile failure when CONFIG_USBDEV_CDC_NCM_USING_LWIP is disabled
- fix GET/SET_NTB_INPUT_SIZE operating on the OUT direction size, and
  honor the negotiated IN limit in the transmit path
- set tx busy flag before submitting the transfer to avoid a race that
  could block transmit permanently
- follow the ndp chain via wNextNdpIndex so chained datagrams are not
  dropped, and access ntb fields with LE helpers instead of assuming a
  little-endian target
- reject oversized frames instead of transmitting truncated ones
- register endpoints only once when initializing both interfaces
- wait for tx completion with a timeout in the demo instead of an
  unbounded busy wait
- make usbd_cdc_ncm.h self-contained

Co-Authored-By: Claude <[email protected]>

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Co-authored-by: Claude <[email protected]>

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