HCI_OP_READ_REMOTE_EXT_FEATURES
cp = hci_sent_cmd_data(hdev, HCI_OP_READ_REMOTE_EXT_FEATURES);
hci_send_cmd(hdev, HCI_OP_READ_REMOTE_EXT_FEATURES,
HCI_CS(HCI_OP_READ_REMOTE_EXT_FEATURES,