Bluetooth: MGMT: Fix failing to MGMT_OP_ADD_UUID/MGMT_OP_REMOVE_UUID

These commands don't require the adapter to be up and running so don't
use hci_cmd_sync_queue which would check that flag, instead use
hci_cmd_sync_submit which would ensure mgmt_class_complete is set
properly regardless if any command was actually run or not.

Link: https://github.com/bluez/bluez/issues/809
Fixes: d883a466

 ("Bluetooth: hci_sync: Only allow hci_cmd_sync_queue if running")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>