bluetooth: host: perform hci-reset in bt_disable()

- added HCI command to send hci-reset in bt_disable() func, and
  remove its call from the driver close() call.
- remove rsp buf pass to 'hci_reset_complete()' func as status is
  already checked under 'bt_hci_cmd_send_sync()'.

Signed-off-by: Nirav Agrawal <nirav.agrawal@nxp.com>