usbd: device_next: cdc: add option to enable short packet terminate

For usbser.sys driver, which is the default USB host driver for CDC
devices in windows, it is expected that USB device always indicate
completion of transmission by short packet. In case where the last
packet length is multiple of max packet size of the BULK IN endpoint,
the USB device shall indicate completion of transmission by sending a
zero length packet. This commit adds the sending of the short packet
termination mentioned above, ensuring condition of short packet
terminate is fulfilled.

Signed-off-by: Chew Zeh Yang <zeon.chew@ambiq.com>