Bluetooth: Controller: Fix build for hci_uart sample with new LLCP

ull_tx_queue.h needs to be included before ll_sw/ull_conn_types.h

zephyr/zephyr/subsys/bluetooth/controller/hci/hci.c
In file included from zephyr/zephyr/subsys/bluetooth/controller/
    hci/hci.c:52:
../../subsys/bluetooth/controller/./ll_sw/ull_conn_types.h:453:18:
     error: field 'tx_q' has incomplete type
  453 |  struct ull_tx_q tx_q;
      |                  ^~~~

Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>