Bluetooth: HCI: Add IPC(11) bus type

Zephyr(1) has been using the same bus defines as Linux so tools likes of
btmon, etc, are able to decode the bus used by the driver to transport
HCI packets.

Link: https://github.com/zephyrproject-rtos/zephyr/pull/80808


Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>