Bluetooth: bpa10x: Add support for hci_set_fw_info

The Digianswer sniffer devices allow for reading a firmware specific
information string. If it is available, then inform the Bluetooth core
about it via hci_set_fw_info. That exposes it via debugfs like this:

  # cat /sys/kernel/debug/bluetooth/hci0/firmware_info
  SNIF_102,BB930,02/01/18,10:37:56
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>

drivers/bluetooth/bpa10x.c

@@ -274,6 +274,8 @@ static int bpa10x_setup(struct hci_dev *hdev)
 
 	BT_INFO("%s: %s", hdev->name, (char *)(skb->data + 1));
 
+	hci_set_fw_info(hdev, "%s", skb->data + 1);
+
 	kfree_skb(skb);
 	return 0;
 }